Answer:
CH₂
Explanation:
Given parameters:
Percentage composition:
Carbon = 40.1%
Hydrogen = 6.6%
Unknown:
Empirical formula of the compound = ?
Solution:
The empirical formula of a substance is its simplest formula.
Elements Carbon Hydrogen
Percentage
Composition 40.1 6.6
Molecular mass 12 1
Number of moles 40.1/12 6.6/1
3.342 6.6
Divide through by
the smallest 3.342/3.342 6.6/3.342
1 2
So the empirical formula of the compound is CH₂
Do any water molecules become gas particles when the vapor pressure is lower than atmospheric pressure? Why or why not?
Answer:
Yes, water molecules becomes gas particles when the vapor pressure is lower than the external atmospheric temperature.
Explanation:
Vapor pressure is defined as the pressure of the vapor that lies above its surface. In other words, it is the pressure of the vapor which results from the evaporation of a liquid which is above a liquid in a closed or open container.
The liquid starts boiling or evaporation takes place when the vapor pressure of the liquid becomes equal to the external or atmospheric pressure. Now when the vapor pressure is less than the atmospheric pressure, the liquid boils at a higher temperature while when vapor pressure is more than the atmospheric temperature, the liquid starts boiling a lower temperature.
No water molecule is converted into gas when the atmospheric pressure is higher than vapour pressure.
No, water molecules will not become gas particles when the vapor pressure is lower than atmospheric pressure because of the higher pressure of surrounding environment on the water molecules. The water in liquid form is converted into gas form and evaporated when the vapour pressure is equal or higher than atmospheric pressure.
So if the vapour pressure is lower than the atmospheric pressure than the water molecules will not become gas particle so we can conclude that no water molecule is converted into gas when the atmospheric pressure is higher than vapour pressure.
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How many calories of energy are required to heat an 87 g piece of iron from 30*C to 40*C?.
ses
(The is the specific heat of iron is 0.110 cal/g x *C)
Answer:
95.7 cal
Explanation:
The heat required can be calculated as follows:
heat = m x Cp x ΔT
Where:
m = mass of iron = 87 g
Cp = specific heat of iron = 0.110 cal/g.°C
ΔT = change in temperature = final T - initial T = 40°C - 30°C = 10°C
Thus, we introduce the data in the mathematical equation to calculate the heat in calories:
heat = 87 g x 0.110 cal/g.°C x 10°C = 95.7 cal
How many grams of iron are in 350 mg of iron?-
Answer:
0.350 g of iron
Explanation:
Step 1: Given data
Mass of iron (m): 350 mg
Step 2: Convert the mass of iron to milligrams
In order to convert the mass of iron from grams to milligrams we need a conversion factor. In this case, the conversion factor is 1 g = 1,000 mg.
350 mg Fe × 1 g Fe/1,000 mg Fe = 0.350 g Fe
350 milligrams of iron is equal to 0.350 grams of iron. We conserve the 3 significante figures of the original data.
what does dissocation of hydrogen mean ?
Answer:
dissociation, in chemistry, separation of a substance into atoms or ions. ... For example, hydrogen molecules (H2) dissociate into atoms (H) at very high temperatures; at 5,000°K about 95% of the molecules in a sample of hydrogen are dissociated into atoms.
Explanation:
Choose one region on the world map. How does the climate there differ during El Niño and La Niña?
United States
The jet stream is oriented from west to east across the southern portion of the United States, during El Niño. Although El Niño's strongest impacts are felt around the equatorial Pacific, they can affect weather around the world by influencing high and low pressure systems, winds and precipitation. And as the warmer ocean waters release excess energy (heat) into the atmosphere, global temperatures rise.
During La Niña, the jet stream and severe weather are likely to be farther north. It refers to the periodic cooling of sea-surface temperatures across the east-central equatorial Pacific.
El Niño and La Niña result from interaction between the surface of the ocean and the atmosphere in the tropical Pacific. Changes in the ocean impact the atmosphere and climate patterns around the globe. In turn, changes in the atmosphere impact the ocean temperatures and currents.
The region chosen is United States and the southern tier of Alaska and the U.S. Pacific Northwest tends to be warmer than average during El Niño and La Niña.
What is Climate?This is defined as the average weather condition of a place over a given period of time.
The U.S.southern tier of state also tends to be cooler during this period which makes it the most appropriate choice.
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please help ill give you points and brainliest please
Answer:
Answers with detail are given below
Explanation:
1) Given data:
Mass of Rb₃Rn = 76.19 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass = 478.43 g/mol
Number of moles = 76.19 g/ 478.43 g/mol
Number of moles = 0.16 mol
2) Given data:
Mass of FrBi₂ = 120.02 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass = 640.96 g/mol
Number of moles = 120.02 g/640.96 g/mol
Number of moles = 0.19 mol
3) Given data:
Mass of Zn₂F₃ = 88.24 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass = 187.73 g/mol
Number of moles = 88.24 g/ 187.73 g/mol
Number of moles = 0.47 mol
4) Given data:
Number of moles of Sb₄Cl = 1.20 mol
Mass of Sb₄Cl = ?
Solution:
Number of moles = mass/molar mass
Molar mass = 522.49 g/mol
Mass = Number of moles × molar mass
Mass = 1.20 mol × 522.49 g/mol
Mass = 626.99 g
Balance the following equation: Ag+O_(2) > Ag_(2)O
Answer:
Ag+o ___>2Ag+3o
I think is answer
Answer:
4Ag + O₂ → 2Ag₂O
Explanation:
Given reaction expression:
Ag + O₂ → Ag₂O
The problem here is to balance the expression.
We are going to use a mathematical approach to solve this problem. Therefore, assign coefficients a,b and c to the species:
aAg + bO₂ → cAg₂O
Conserving Ag; a = 2c
O; 2b = c
Now let c = 1;
a = 2
b = [tex]\frac{1}{2}[/tex]
Multiply a, b and c through by 2;
a = 4, b = 1 and c = 2
4Ag + O₂ → 2Ag₂O
Which of the following is true for the theoretical yield of a reaction? (1 point)
It is always calculated as a ratio.
It is the yield from the excess reactant.
It is the yield from the limiting reactant.
It is always twice the value of the actual yield.
Answer:
It is always twice the value of the actual yield.
Explanation:
When writing a chemical name, what is written first?
10.
(05.05 MC)
Read the chemical equation.
Fe2O3 + CO → Fe + CO2
If 1.8 moles of Fe2O3 react with 2.7 moles of CO, how many moles of each product are formed? (3 points)
5.4 moles Fe and 1.8 moles CO2
2.7 moles Fe and 0.9 moles CO2
3.6 moles Fe and 5.4 moles CO2
1.8 moles Fe and 2.7 moles CO2
Answer: 1.8 moles Fe and 2.7 moles [tex]CO_2[/tex] are produced.
Explanation:
The balanced chemical reaction is:
[tex]Fe_2O_3+3CO\rightarrow 2Fe+3CO_2[/tex]
According to stoichiometry :
3 moles of [tex]CO[/tex] require 1 mole of [tex]Fe_2O_3[/tex]
Thus 2.7 moles of [tex]CO[/tex] will require=[tex]\frac{1}{3}\times 2.7=0.9moles[/tex] of [tex]Fe_2O_3[/tex]
Thus [tex]CO[/tex] is the limiting reagent as it limits the formation of product and [tex]Fe_2O_3[/tex] is the excess reagent.
As 3 moles of [tex]CO[/tex] give = 2 moles of [tex]Fe[/tex] and 3 moles of [tex]CO_2[/tex]
Thus 2.7 moles of [tex]CO[/tex] will give =[tex]\frac{2}{3}\times 2.7=1.8moles[/tex] of [tex]Fe[/tex] and [tex]\frac{3}{3}\times 2.7=2.7moles[/tex] of [tex]CO_2[/tex]
Thus 1.8 moles Fe and 2.7 moles [tex]CO_2[/tex] are produced.
I need help with science question. Picture attached
Answer:
C
cell wall only in plants
chloroplast only in plants
enlarged vacuoles only in plants
cell membrane in both
hope this helps :)
Explanation:
Answer:
a. cell wall b. membrane
Please help!!! I’ll give brainlist
If closer means that it is inner, then it would be they are closer and made of rocks.
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energy from the sun provides fuel for entire ecosystems true or false
Answer: True
Explanation:
A chemist adds 1.80L of a 1.1/molL aluminum chloride AlCl3 solution to a reaction flask. Calculate the millimoles of aluminum chloride the chemist has added to the flask. Round your answer to 2 significant digits.
Answer:
2000 millimoles of AlCl₃
Explanation:
From the question given above, the following data were obtained:
Volume of solution = 1.8 L
Molarity of solution = 1.1 mol /L
Millmole of AlCl₃ =?
Next, we shall determine the number of mole of AlCl₃ in the solution.
This can be obtained as follow:
Volume of solution = 1.8 L
Molarity of AlCl₃ solution = 1.1 mol /L
Number of mole of AlCl₃ =?
Molarity = mole /Volume
1.1 = Number of mole of AlCl₃ / 1.8
Cross multiply
Number of mole of AlCl₃ = 1.1 × 1.8
Number of mole of AlCl₃ = 1.98 moles
Finally, we shall convert 1.98 moles to millimoles. This can be obtained as follow:
1 mole = 1000 millimoles
Therefore,
1.98 mole = 1.98 mole × 1000 millimoles / 1 mole
1.98 mole = 1980 millimoles
1.98 mole ≈ 2000 millimoles
Thus, the chemist added 2000 millimoles of AlCl₃
Considering this balanced chemical equation, how many grams of HgO will be produced when 44 g of Hg react with excess O2?
2Hg (l) + O2 (g) --> 2HgO (s)
A 28 g
B 44 g
C 48 g
D 96 g
Also, how would you go to solve this problem? Thanks!
Answer:
48g
Explanation:
2Hg(l) + O₂(g) => 2HgO
44g excess ?
44g/200.59g·mol⁻¹ = 0.219 mole Hg(l) = 0.219 mole HgO(s) produced.*
*Since coefficients are equal for Hg and HgO then the moles of HgO produced is the same as moles Hg used.
Convert 0.219 mole HgO to grams => 0.219mol x 216.95g/mol = 47.512g HgO ≅ 48g (2 sig figs)
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The correct option is option C.
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.
The other characteristic of balanced reaction is that physical state should be written with each compound or molecule on reactant and product side. Physical state should be written in brackets. s means solid, l means liquid, g means gas.
2Hg(l) + O₂(g) [tex]\rightarrow[/tex] 2HgO
44g excess ?
The mole ratio between Hg and HgO is 1:1.
44g÷200.59g/mol= 0.219 mole of Hg= 0.219 mole of HgO
mass of HgO=0.219mol x 216.95g/mol
= 47.512g
Therefore, the correct option is option C.
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Which of the following elements belong to the same group/family?
A. H and He
B. Li and Be
C. C and Pb
D. Ni and Ra
Answer:
C. C and Pb
Both are in group IV elements.
Reaction: 2 Ag2CO3 --> 4 Ag + 2 CO2 + O2, how many moles of silver will
be produced when 97.4g of silver carbonate decomposes?
Answer:
0.7 moles of Ag are produced
Explanation:
Given data:
Mass of silver carbonate = 97.4 g
Moles of silver produced = ?
Solution:
Chemical equation:
2Ag₂CO₃ → 4Ag + 3CO₂
Number of moles of Ag₂CO₃ :
Number of moles = mass/molar mass
Number of moles = 97.4 g/ 275.75 g/mol
Number of moles = 0.35 mol
Now we will compare the moles of Ag and Ag₂CO₃.
Ag₂CO₃ : Ag
2 : 4
0.35 : 4/2×0.35 = 0.7
0.7 moles of Ag are produced.
2
3 of 6 - SCH4U
Date: Name(s):
4. HCl is a corrosive colourless gas that dissolves readily in water.
Aqueous HCl reacts with NaOH to form water and NaCl. In a simple
calorimeter, a 100.00 mL sample of 0.415 mol/L HCl(aq) is mixed
with 50.00 mL of excess NaOH(aq). During the reaction, there is a
rise in temperature by 4.83 °C. Calculate the molar enthalpy change
(in kJ/mol) for the above reaction. SHOW ALL YOUR WORK.
Answer: The molar enthalpy change is 73.04 kJ/mol
Explanation:
[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]
moles of HCl= [tex]molarity\times {\text {vol in L}}=0.415mol/L\times 0.1=0.0415mol[/tex]
As NaOH is in excess 0.0415 moles of HCl reacts with 0.0415 moles of NaOH.
volume of water = 100.0 ml + 50.0 ml = 150.0 ml
density of water = 1.0 g/ml
mass of water = [tex]volume \times density=150.0ml\times 1.0g/ml=150.0g[/tex]
[tex]q=m\times c\times \Delta T[/tex]
q = heat released
m = mass = 150.0 g
c = specific heat = [tex]4.184J/g^0C[/tex]
[tex]\Delta T[/tex] = change in temperature = [tex]4.83^0C[/tex]
[tex]q=150.0\times 4.184\times 4.83[/tex]
[tex]q=3031.3J[/tex]
Thus 0.0415 mol of HCl produces heat = 3031.3 J
1 mol of HCL produces heat = [tex]\frac{3031.3}{0.0415}\times 1=73043.3J=73.04kJ[/tex]
Thus molar enthalpy change is 73.04 kJ/mol
What are the relationships between temperature and viscosity of water?
Explanation:
Both cohesion and molecular interchange contribute to liquid viscosity. The impact of increasing the temperature of a liquid is to reduce the cohesive forces while simultaneously increasing the rate of molecular interchange. The former effect causes a decrease in the shear stress while the latter causes it to increase.
temperature?
The viscosity of liquids decreases rapidly with an increase in temperature, and the viscosity of gases increases with an increase in temperature. Thus, upon heating, liquids flow more easily, whereas gases flow more sluggishly.
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snow and ice absorbs much of the Sun's radiant energy
True or False?
Answer:
Snow and ice have high albedo – much of the sunlight hitting surfaces covered with snow and ice bounces back. ... Thus, the proportion of Earth's surface that is covered by ice and snow affects how much of the Sun's solar radiation is absorbed, warming the planet, or reflected.
Change 32°C to degree °F
Answer:
89.6 F
Explanation:
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The formula mass of HC2H302 is
1.
59
2.
60
3.
72
4.
80
Answer:
60
Explanation:
The formula of the compound is given as:
HC₂H₃O₂
To find the formula mass we sum up the atomic masses of the component elements;
Atomic mass:
H = 1
C = 12
O = 16
HC₂H₃O₂ = 1 + 2(12) + 3(1) + 2(16)
= 1 + 24 + 3 + 32
= 60
The table below shows the dimensions of two colored cubes.
Dimensions of Cubes
Cube Side (cm) Mass
(g)
Blue 5 250
White 4 320
Which cube is denser?
Blue, because the ratio of its mass and side is higher.
White, because the ratio of its mass and side is lower.
Blue, because it has more volume and less amount of matter.
White, because it has less volume, but a lot more matter.
i think it's d white one cause it's has less volume but more matter making its mass volume ratio high than that of the blue one
The white cube is denser, because it has less volume, but a lot more matter. So option D is correct.
What is matter ?A material called matter is made up of several kinds of particles, occupies space, and has inertia. The many sorts of particles each have a unique mass and size according to the fundamentals of current physics. The electron, proton, and neutron are three examples of material particles that are most well-known.
A material with a given mass and a certain volume in space is referred to as a matter. Examples of matters are pens, pencils, toothbrushes, water, and milk, as well as vehicles like cars, buses, and bicycles.
According to its physical and chemical makeup, "matter" can be defined as being composed of atoms. Ordinary matter is another name for such atomic stuff. For instance, since DNA molecules are composed of atoms, they fall under the notion of matter.
Thus, option D is correct.
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When 1.0 g of gasoline burns, it released 11 kcal of heat. The density of gasoline is 0.74 g/mL. How many Joules of heat is released when 1.5 gallons of gasoline burns?
Answer:
[tex]Q=1.9x10^8J[/tex]
Explanation:
Hello!
In this case, since we first know the heat and mass of the first experiment, we are able to compute enthalpy of vaporization of gasoline as shown below:
[tex]Q=m\Delta _{vap} H\\\\\Delta _{vap} H=\frac{11kcal}{1.0g} =11\frac{kcal}{g}[/tex]
Next, we need to the compute the grams in 1.5 gallons of gasoline via its density with the proper units:
[tex]m_{gasoline}=1.5gal*\frac{3785.41mL}{1gal}*\frac{0.74g}{1mL} =4202g[/tex]
Therefore, the new joules are computed via:
[tex]Q=4202g*11\frac{kcal}{g}*\frac{1000cal}{1kcal}*\frac{4.184J}{1cal}\\\\Q=1.9x10^8J[/tex]
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explain what happens to the concentrations of the reactants and products during a chemical reaction
I need the answer today!
_____________________________________________
Solution 3 Is The Most ConcentratedS1:M = m/v
= 100ml ÷ 2 spoons × 100%
= - 5,000 μg/ppb³
= 50% Diluted
S2:M = m/v
= 200ml ÷ 5 spoons × 100%
= - 4,000 μg/ppb³
= 40% Diluted
S3:M = m/v
= 300ml ÷ 6 spoons × 100%
= - 5,000 μg/ppb³
= 50% Diluted
S4:M = m/v
= 600ml ÷ 8 spoons × 100%
= - 75,000 μg/ppb³
= 75% Diluted
_____________________________________________
the question in the picture
plz help
and give me an explanation
Answer:
B. CH3CH2CH2CH2CH2C1Explanation:
I HOPE IT HELPS :)
Where does photosynthesis occur in a plant cell, specifically what
organelle?
2 points
Your answer
During the chemical reaction of photosynthesis. Light energy is converted 2 points
into what type of energy?*
Your answer
2 points
Look at this image, which numbers represent the PRODUCTS of
photosynthesis?
Sun's energy
Answer:
1) chloroplast
A chloroplast is an organelle within the cells of plants and certain algae that is the site of photosynthesis, which is the process by which energy from the Sun is converted into chemical energy for growth.
2)Photosynthesis is the process in which light energy is converted to chemical energy in the form of sugars. In a process driven by light energy, glucose molecules (or other sugars) are constructed from water and carbon dioxide, and oxygen is released as a byproduct.
3)i need the photo to answer
Explanation:
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A diamond contains 5.0 x 10^(21) atoms of carbon. What amount (moles) of carbon and what mass (grams) of carbon are in this diamond
Answer:
Amount (Mole) of carbon = 0.008303 mole
Mass (gramm)of Carbon = 0.0997 g.
Explanation:
From Avogadro's law, we know that 1 mole of carbon contains 6.022×10²³ atoms.
Then the mole of carbon that contains 5.0×10²¹ atoms can be computed as (5.0×10²¹ / 6.022×10²³)
=0.008303 mole
5.0×10²¹ atoms is contained in 0.008303 mole
Hence, Amount (Mole) of carbon = 0.008303 mole
the mass of carbon can be computed , we know that
Mole = mass /Molar mass
Where Molar mass of carbon = 12.01 g/mol
n=0.008303 mol
Making " mass" subject of the formula,
mass=Mole ,× Molar mass
=0.008303 x 12.01
= 0.0997 g.
write the formula to iron (III) oxide and iron (III) carbonate
Answer:
iron (III) oxide =Fe2O3
iron(III) carbonate =Fe2(CO3)3