Answer:
Explanation:
1 mol of sodium = 23 grams (use the number on your periodic table).
0.7350 mol sodium = x
Cross multiply
1*x = 0.7350 * 23
x = 16.905
You will get slightly less than this, depending on your periodic table. But the method will be the same.
How do you write 0.000157 in scientific notation
Answer:
1.57 × 10^-4
one point five seven times ten to the power of negative four
What is the mass of 2.90 L of O2 gas at STP
Answer:
4.16 g
Explanation:
Volume, V = 2.90 L
STP mans standard temperature and pressure
T = 273 K
P = 1 atm
Mass = ?
Using the ideal gas equation;
PV = nRT
where R = General gas constant = 0.082 L atm mol-1 K-1
n = PV / RT
n = 1 * 2.90 / (0.082 * 273)
n = 2.90 / 22.386
n = 0.130 mol
The relationship between moles and mass;
Mass = number of moles * Molar mass
Mass = 0.130 mol * 32 g/mol
Mass = 4.16 g
Answer:4.14
Explanation:just answered the question
Gaseous methane (CH4) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). If 28.2 g of carbon dioxide is produced from the reaction of 15.1 g of methane and 81.2 g of oxygen gas, Calculate the percent yield of carbon dioxide. Be sure your answer has the correct number of significant digits in it.
Answer:
68.1% is percent yield of the reaction
Explanation:
The reaction of methane with oxygen is:
CH₄ + 2O₂ → CO₂ + 2H₂O
Where 2 moles of oxygen react per mole of CH₄
Percent yield is:
Actual yield (28.2g CO₂) / Theoretical yield * 100
To solve this question we need to find theoretical yield finding limiting reactant :
Moles CH₄:
15.1g CH₄ * (1mol / 16.04g) = 0.9414 moles
Moles O₂:
81.2g * (1mol / 32g) = 2.54 moles
For a complete reaction of 0.9414 moles of CH₄ are needed:
0.9414 moles CH₄ * (2 mol O₂ / 1mol CH₄) = 1.88 moles of O₂. As there are 2.54 moles, O₂ is in excess and CH₄ is limiting reactant
In theoretical yield, the moles of methane added = Moles of CO₂ produced. That is 0.9414 moles CO₂. In grams = Theoretical yield:
0.9414 moles CO₂ * (44.01g / mol) = 41.43g CO₂
Percent yield: 28.2g CO₂ / 41.43g CO₂ * 100=
68.1% is percent yield of the reactionwhat mass, in grams, of CO2 and H2O
is formed from 2.55 mol of propane?
Answer:
336.6 grams of CO₂ and 183.6 grams of H₂O are formed from 2.55 moles of propane.
Explanation:
In this case, the balanced reaction is:
C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactant and product participate in the reaction:
C₃H₈: 1 moleO₂: 5 molesCO₂: 3 molesH₂O: 4 molesBeing the molar mass of each compound:
C₃H₈: 44 g/moleO₂: 16 g/moleCO₂: 44 g/moleH₂O: 18 g/moleThen, by stoichiometry, the following quantities of mass participate in the reaction:
C₃H₈: 1 mole* 44 g/mole= 44 gramsO₂: 5 moles* 16 g/mole= 80 gramsCO₂: 3 moles* 44 g/mole= 132 gramsH₂O: 4 moles* 18 g/mole= 72 gramsSo you can apply the following rules of three:
If by stoichiometry 1 mole of C₃H₈ forms 132 grams of CO₂, 2.55 moles of C₃H₈ how much mass of CO₂ will it form?[tex]mass of CO_{2} =\frac{2.55 moles of C_{3} H_{8}*132 gramsof CO_{2} }{ 1 mole of C_{3} H_{8}}[/tex]
mass of CO₂= 336.6 grams
If by stoichiometry 1 mole of C₃H₈ forms 72 grams of H₂O, 2.55 moles of C₃H₈ how much mass of H₂O will it form?[tex]mass of H_{2}O =\frac{2.55 moles of C_{3} H_{8}*72 gramsof H_{2}O }{ 1 mole of C_{3} H_{8}}[/tex]
mass of H₂O= 183.6 grams
336.6 grams of CO₂ and 183.6 grams of H₂O are formed from 2.55 moles of propane.
__Fe + ___ Cl2 --> ___FeCl3
The coefficient on iron for this equation is:
A 4
B 2
C 1
D 3
Use the periodic table to select the element that best fits each of the following descriptions.
Noble gas:
O oxygen
O chlorine
Okrypton
Answer:
Krypton
Explanation:
What important function do currents and areas of upwelling provide for living things
in the sea?
Recycles the ocean water through evaporation and precipitation
Brings nutrients up from deeper water for use by organisms
Mixes land and sea organisms to broaden the food web
Allows Earth to have weather and climate changes
A species is
O the least specific group
O not a group at all
o the most specific group
the largest group
what happens when hydrogen gas is passed over hot ferric oxide
Answer:
When hydrogen is passed over hot ferric oxide (FeO) hydrogen reacts with oxygen present in the compound and forms water (H2O) and pure Iron
Explanation:
Answer:When hydrogen gas is passed over hot copper oxide, the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained.
Explanation:
Which of the following is an example of a physical change, but not a chemical change?
Answer:
Boiling Water
Explanation:
Boiling water is an example of physical change and not and not a chemical change because the water vapor still has the same molecular structure as liquid water.If the bubbles were caused by the decomposition of a molecule into gas then boiling would be a chemical change.
Answer:
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding
Explanation:
Please help!!! It's Due TODAY!!! Imagine a made up polyatomic ion called tritoborate. Calcium tritoborate has the formula Ca2B3O8.
a. What is the formula for tritoborate? You must include the charge (both the sign and the
magnitude). (2 pts)
b. Write both the formula and the name for the compound formed when Fe3+ combines
with tritoborate? (2 pts)
Answer:
a. The formula for tritoborate ion is B₃O₈²⁻
b. The formula of the compound formed will be Fe₂(B₃O₈)₃ and the name will be Iron (iii) tritoborate
Explanation:
The formation of compounds by atoms of elements occurs in accordance with the valencies of the elements. Valency refers to the combining power of an element. For metallic elements, it is usually the number of electrons they can give up or lose while for non-metallic elements, it is the number of electrons they can accept. The valency of an atom of an element is related to its oxidation number. Metals have positive oxidation numbers while non-metals have negative oxidation numbers. Sometimes, two or more atoms combine together and react as a single unit and may carry a positive or negative charge. These are known as a radicals. For example, ammonium ion, NH₄⁺.
In the given question, calcium tritoborate, CaB₃O₈ is formed from the combination of calcium ion and tritoborate ion. Calcium ion carries the charge of +2, therefore, the tritoborate ion must have a charge of -2 in order to form a compound since the overal charge on a compound is zero.
a. let the tritoborate ion be represented by X
Ca = +2, X = ?
+2 + X = 0
X = -2
Thus, the formula for tritoborate ion is B₃O₈²⁻
b. When tritoborate ion combines with iron (iii) ion, Fe³⁺, two moles of Fe³⁺ will be required to react with three moles of B₃O₈²⁻ in order to have a neutral compound. The formula of the compound formed will be: Fe₂(B₃O₈)₃ and the name will be Iron (iii) tritoborate
What 2 things are produced by photosynthesis? Answer please
Answer:
Oxygen and glucose
Explanation:
Plants use the sun, water, and CO2 to make their own energy. Glucose is the result, and Oxygen is just a biproduct.
Deforestation happens when people try to provide more:
a) water
b) waste
c) timber
d) oxygen.
How much money will it cost you to drive 255 miles if your car gets 25.70 miles per gallon and gas costs $3.309/gallon?
Which process directly moves nutrients from plants to the air
A) Percolation
B) Transportation
C) Assimilation
D) Photosynthesis
Answer:
Plants release oxygen in the process of Photosynthesis
Explanation:
How many molecule are in 1.80mol of water
Answer:
1 molecule of H2O contains 10 electrons. So one mole that is equal to 22.4 L of H2O will contain 6.022 × 10^23 × 10 electrons. So 1.8 ml will have - 6.022×10^23×1.8×10/22.4 ×1000=6.022×10^21×1.8/22.4.
Explanation:
I just saw this answer here in brainly
Aspirin was formed to reduce the irritation of salicylic acid. However, aspirin can still disturb the stomach. Which functional group in aspirin is responsible for stomach irritation? A. Ketone B. Ester C. Carboxylic acid D. Phenol
Answer:
Carboxylic acid
Explanation:
Asprin is a drug that contains the carboxylic acid functional group (R-COOH), ester functional group (R-O-CO-R') and the aromatic group (benzene ring).
When we take in aspirin, it becomes salicylic acid. This metabolite irreversibly inhibits the enzyme cyclooxygenase. Hence the the production of protective prostaglandins is blocked causing inflammation and pain.
In the picture below, ammonia and bleach are mixed together. How many nitrogen (N) atoms will be in the products?
1
ammonia: NH3 (one nitrogen)
bleach: NaOCl (zero nitrogen)
The proper dosage of a certain medication is 0.50 mg per kilogramof of patient weight. The medication is the Spence in a liquid that contains 350.0ug of medication per mL of liquid. What volume of liquid medication should be given to a 183 Ib patient. (1kg= 2.204 lb)
Answer:
118.61 mL.
Explanation:
Hello!
In this case, since we know the concentration in the medication:
[tex]\frac{350.0\mu g}{1mL}[/tex]
Now, since there are 0.50 mg of the medication per kilogram of patient, we can compute the volume as shown below for a 183-lb patient:
[tex]183lb*\frac{1kg}{2.204lb}* \frac{0.50mg}{1kg} *\frac{1000\mu g}{1mg} *\frac{1mL}{350.0\mu g} =118.61mL[/tex]
Best regards!
Carbon monoxide and carbon dioxide have
Answer:
different chemical properties and the same physical properties
Explanation:
Both carbon monoxide and carbon dioxide are gases.
So physically, the two compounds have no fixed shape and volume and their molecules are far apart.
Therefore, they have similar physical properties.
Based on chemical properties, the compounds or molecules given are different.
They will combine chemically in diverse ways.
3. different chemical properties and the same physical properties
Physical properties:
Both carbon monoxide and carbon dioxide are gases. So physically, the two compounds have no fixed shape and volume and their molecules are far apart. Therefore, they have similar physical properties.Chemical properties:
The compounds or molecules given are different. They will combine chemically in diverse ways.Carbon Dioxide (CO₂) is a chemical compound consisting of one carbon atom and two oxygen atoms while Carbon Monoxide (CO) is a chemical compound which contains one carbon atom and one oxygen atom.CO is also a colorless and odorless gas while CO₂ is entirely human-made and is not naturally present in the atmosphere.Thus, both gases are chemically different.Therefore, option 3 is correct.
Learn more:
brainly.com/question/15821287
The picture has my question
Answer:
b or c
Explanation:
A standard 10.00 g mass is weighed on an analytical balance 100 times. The average and standard deviation obtained gives 10.12 ± 0.03 g. A calibration service is called. After the balance is recalibrated, the new measurements show 10.00 ± 0.03 g. Did the recalibration result in improved accuracy or precision?
Answer:
There was an improvement in accuracy. There was no change in precision.
Explanation:
The average mass after recalibration is closer to the mass of the standard, so the recalibration improved the accuracy (the measurement is closer to an accepted 'true' value).
The standard deviation did not change, so the precision (or how disperse the measurements are) was not affected.
How many molecule are in 1.80mol of water
Answer:
1 molecule of H2O contains 10 electrons. So one mole that is equal to 22.4 L of H2O will contain 6.022 × 10^23 × 10 electrons. So 1.8 ml will have - 6.022×10^23×1.8×10/22.4 ×1000=6.022×10^21×1.8/22.4
Explanation:
The total age of 5 children aged 3 years is 50 years. Find the age of the youngest and oldest child?
Answer: See explanation
Explanation:
Here's the correct question:
The total ages of 5 children born at the intervals of 3 years each is 50 years. Find the age of the youngest and the oldest child.
From the information given, we can then make the following assumption with regards to their ages.
First child = y
Second child = y + 3.
Third child = y + 6
Fourth child = y + 9
Fifth child = y + 12
Therefore, y + y+3 + y+6 + y+9 + y+12 = 50
5y + 30 = 50
5y = 50 - 30
5y = 20
y = 20/5
y = 4
Youngest child = 4 years
Oldest child = y + 12 = 4 + 12 = 16 years
When air cools, water molecules lose energy and
or change into liquid form.
The orbit closest to the nucleus has ___________ energy.
Answer:
inonic bonds with cavalent bonds
Explanation:
ionic bonds
According to the law of conservation of matter, we know that the total number of atoms does not change in a chemical reaction and thus mass is conserved. This
is part of a chemical reaction: hydrogen plus oxygen yields water. Can you complete this model? Reorganize the reactants in order to complete the product side
of the reaction
Your answer:
There is another answer choice with 4 reactants
Answer:
the answer is second option. with 2 models
Explanation:
2H2 + O2 gives 2H2O
so there's two models
What is the mass of 5 liters of fluorine (F2) gas at STP?
Answer:
The molar density of any ideal gas at STP is:
1 mol / 22.4 L = 0.04464 mol / L
The molar mass of F2 is: 2(19) = 38 g/mol
0.04464 mol / L * (38 g / mol) = 1.70 g/L
Explanation:
what type of boundary is formed when two continental plates converge, buckle and push up into mountain rages?
Answer: Convergent Boundary
Explanation:
Two plates converge at one point
[24 points] A sample of soil has a total volume of 205 cm3. The soil mass when saturated is 361 g. A specific yield test was conducted on the soil by allowing the sample to drain for 24 hours. After drainage the sample mass was 295 g. The soil was then dried and weighed 284 g. What are the specific yield [8 points], specific retention [8 points], and porosity [8 points] of the sample
Answer:
Follows are the solution to the given question:
Explanation:
Dry Soil weight = solid soil weight = [tex]284 \ grams[/tex]
solid soil volume =[tex]205 \ cc[/tex]
saturated mass soil = [tex]361 \ g[/tex]
The weight of the soil after drainage is =[tex]295 \ g[/tex]
Water weight for soil saturation = [tex](361-284) = 77 \ g[/tex]
Water volume required for soil saturation =[tex]\frac{77}{1} = 77 \ cc[/tex]
Sample volume of water: [tex]= \frac{\text{water density}}{\text{water density input}}[/tex]
[tex]= 361- 295 \\\\ = 66 \ cc[/tex]
Soil water retained volume = (draining field weight - dry soil weight)
[tex]= 295 - 284 \\\\ = 11 \ cc.[/tex]
[tex]\text{POROSITY}= \frac{\text{Vehicle volume}}{\text{total volume Soil}}[/tex]
[tex]= \frac{77}{(205 + 77)} \\\\= \frac{77}{(282)} \\\\ = 27.30 \%[/tex]
(Its saturated water volume is equal to the volume of voids)
[tex]\text{YIELD SPECIFIC} = \frac{\text{Soil water volume}}{\text{Soil volume total}}[/tex]
[tex]= \frac{66}{(205+77)}\\\\= \frac{66}{(282)}\\\\=0.2340\\\\ = 0.23[/tex]
[tex]\text{Specific Retention}= \frac{\text{Volume of soil water}}{\text{Total soil volume}}[/tex]
[tex]= \frac{11}{282} \\\\= 0.0390 \\\\ = 0.04[/tex]