Answer:
87.75%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2Na + Cl₂ —> 2NaCl
Next, we shall determine the masses of Na and Cl₂ that reacted and the mass of NaCl produced from the balanced equation. This can be obtained as follow:
Molar mass of Na = 23 g/mol
Mass of Na from the balanced equation = 2 × 23 = 46 g
Molar mass of Cl₂ = 2 × 35. 5 = 71 g/mol
Mass of Cl₂ from the balanced equation = 1 × 71 = 71 g
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl from the balanced equation = 2 × 58.5 = 117 g
Summary:
From the balanced equation above,
46 g of Na reacted with 71 g of Cl₂ to produce 117 g of NaCl.
Next, we shall determine the limiting reactant.
This can be obtained as follow:
From the balanced equation above,
46 g of Na reacted with 71 g of Cl₂.
Therefore, 2.6 g of Na will react with = (2.6 × 71)/46 = 4.01 g of Cl₂.
From the calculations made above, we can see that only 4.01 g of Cl₂ at of 5 g given in question reacted completely with 2.6 g of Na. Therefore, Na is the limiting reactant and Cl₂ is the excess reactant.
Next, we shall determine the theoretical yield of NaCl. The limiting reactant will be used to obtain the theoretical yield since all of it is consumed in the reaction.
The limiting reactant is Na and the theoretical yield of NaCl can be obtained as follow:
From the balanced equation above,
46 g of Na reacted to produce 117 g of NaCl.
Therefore, 2.6 g of Na will react to produce = (2.6 × 117)/46 = 6.61 g of NaCl.
Thus the theoretical yield of NaCl is 6.61 g
Finally, we shall determine the percentage yield of NaCl. This can be obtained as follow:
Actual yield of NaCl = 5.8 g
Theoretical yield of NaCl = 6.61 g
Percentage yield =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 5.8/6.61 ×100
Percentage yield of NaCl = 87.75%
Which of the following measurements are required to find the work done on an object?
1. The mass and volume of the object
2. The volume of the object and the distance the object moved
3. The force exerted on the object and the distance the object moved
4. The force exerted on the object and the time it took to move the object
Answer:
1.p=mV................
A reaction occurs in a calorimeter that heats up 15g water from 25 oC to 50 oC. The specific heat of water is 4.184 J/goC. Determine the thermal energy (Q) that must have entered the water to produce this temperature change.
The thermal energy (Q) needed : = 1882.8 J
Further explanationGiven
15g water from 25 °C to 50 °C
Required
The thermal energy (Q)
Solution
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Input the value :
Q = 15 g x 4.184 J/g°C x (50 °C- 20 °C)
Q = 1882.8 J
I NEED HELP ASAPPP PLZ
1. Heat needed = 293.25 J
2. Time to leave : 2 s
Further explanationGiven
1.5 g H2
Cp H2 = 14.27 g/J C
Δt= 13.7
Required
1. Heat needed
2. Fridge time
Solution
1. Heat can be formulated :
Q = m.c.Δt
Q = 1.5 x 14.27 x 13.7
Q = 293.25 J
2. Heat decreases = 150 J/s, so for 293.25 J :
[tex]\tt t=\dfrac{293.25~J}{150~J/s}=1.955~s\approx 2~s[/tex]
balance:
_H3[PO4] —> _H4[P2O7] + _H2O
Answer:
2
Explanation:
Answer:
2H3[PO4] —> H4[P2O7] + H2O
Explanation:
help plz will mark brainliest xD
Answer:
Ions are atoms that have either gain or lose electrons from the neutral atom.
A loss of electrons results in a positive ion, called a cation, a gain of electron results in a negative ion called an anion.
Ionic compounds are formed by the combination of a cation and anion, or metal + nonmetal.
When naming ionic compounds, name the cation first, and the anion second, changing the ending to ide.
Explanation:
Hope it helped!
Answer:
• [ lost ] or [ gained ]
• [ cation ], [ anion ]
• [ metal ] + [ non-metal ]
• [ cation ] and the [ anion ] to [ compound with suffix "ide" or "ode" ]
Suppose you have 28.9 grams of elemental germanium, what mass would be the isotope germanium - 72?
34.5 grams
because the mass would multiply and do mass things
describe how calcium may be used in the body
In case you don't know what Calcium Is:
a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions.
Calcium can be found:
Calcium is a soft white chemical element found in bones and teeth
answer:
Using the definition..calcium may be used in the human body by nerve conduction, heartbeat, muscle contraction, and many other physiological functions.
·.•·°.hope this helped!!!·.•·°.
lactic acid is produced from pyruvate by an anaerobic process called
A. protonation
B. fermentation
C. glycolysis
D. phosphorylation
Pls help me thank you
Answer:
B. fermentation
Explanation:
this process is called lactic fermentation where a molecule of gluclose(C6H12O6) is turned into two molecules of pyruvate(C3H4O3) and the pyruvate molecules are turned into lactic acid(C3H6O3) from this process two molecules of ATP are resulted
Answer:
Fermentation
Explanation: I took the test
urgent plzz help meeee thx I HAVE EXAMEEE
Answer: [tex]2Ag^{+}(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]
Explanation:
Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.
The given chemical equation is:
[tex]2AgF(aq)+Na_2CO_3(aq)\rightarrow Ag_2CO_3(s)+2NaF(aq)[/tex]
The complete ionic equation is;
[tex]2Ag^{+}(aq)+2F^-(aq)+2Na^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)+2Na^+(aq)+2F^-(aq)[/tex]
The ions which are present on both the sides of the equation are [tex]Na^+[/tex] and [tex]F^-[/tex] and are not involved in net ionic equation.
Hence, the net ionic equation is :
[tex]2Ag^{+}(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]
what happen when Nacl solution reacts with AgNo3solution .name the two types of reactions to which does it belong
Explanation:
A chemical reaction where two chemical compounds exchange ions with each other is called a double displacement reaction.
Also, when an insoluble salt is formed due to chemical reaction between two chemical compounds is called a precipitation reaction.
For example, [tex]NaCl(aq) + AgNO_3(aq) \rightarrow NaNO_3(aq) + AgCl(s)[/tex]
Here, ions are exchanged between the compounds [tex]NaCl[/tex] and [tex]AgNO_3[/tex] . Also, [tex]AgCl[/tex] is the precipitate formed.
Which of the following shows the correct order of the inner planets?
A: Mercury, Earth, Venus, Mars
B: Mars Mercury Venus Earth
C: Venus, Mars, Erath, Mercury
D: Mercury, Venus, Earth, Mars
Mercury, Venus, Earth,Mars
Answer:
D: Mercury, Venus, Earth, Mars
Explanation:
please help!! i am struggling with this. first correct answer gets brainliest!
Answer: [tex]1.25dm^3[/tex] of unreacted oxygen is left.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given volume}}{\text{Molar Volume}}[/tex]
[tex]\text{Moles of} CO_2=\frac{3.60dm^3}{22.4dm^3}=0.161moles[/tex]
[tex]\text{Moles of} O_2=\frac{7.25dm^3}{22.4dm^3}=0.324moles[/tex]
[tex]C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(l)[/tex]
According to stoichiometry :
3 moles of [tex]CO_2[/tex] = 5 moles of [tex]O_2[/tex]
Thus 0.161 moles of [tex]CO_2[/tex] =[tex]\frac{5}{3}\times 0.161=0.268moles[/tex] of [tex]O_2[/tex]
moles of [tex]O_2[/tex] left unreacted = (0.324-0.268) = 0.056
Volume of [tex]O_2[/tex] left unreacted = [tex]moles\times {\text {Molar volume}}=0.056mol\times 22.4dm^3/mol=1.25dm^3[/tex]
Thus [tex]1.25dm^3[/tex] of unreacted oxygen is left.
During ionic bonding, there is a transfer of electrons....
O from one metallic element to a different metallic element
O from one nonmetallic element to a different nonmetallic element
O from one metallic element to a different metalloid
O from one metallic element to a different nonmetallic element
non polar and polar substances don't mix because of
Explanation:
The molecules in the solute and solvent are only able to make dispersion forces with each other (as they aren't both polar). This only releases very little energy. Therefore overall, more energy is required than released and hence they won't mix.
whats the number of moles of O2(g) needed to completely react with 8 moles of CO(g).
Complete this sentence: The mitochondrion is the place in the cell where ________________.
sunlight is absorbed to produce energy
cellular respiration takes place
photosynthesis takes place
energy is converted to waste
Answer:
cellular respiration takes place
Answer:
sunlight is absorbed to produce energy
Sorry if its worng
how many meteor showers does the earth pass through as it orbits the sun?
Answer:
about 30 meteor showers
Explanation:
Given: 36.7 grams of CaF2 is added to 300 mL water. Find molarity?
2 M
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Unit 0
Reading a Periodic TableUsing Dimensional AnalysisAqueous Solutions
Molarity = moles of solute / liters of solutionExplanation:Step 1: Define
36.7 g CaF₂
300 mL H₂O
Step 2: Identify Conversions
Molar Mass of Ca - 40.08 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of CaF₂ - 40.08 + 2(19.00) = 78.08 g/mol
1000 mL = 1 L
Step 3: Convert
Solute
Set up: [tex]\displaystyle 36.7 \ g \ CaF_2(\frac{1 \ mol \ CaF_2}{78.08 \ g \ CaF_2})[/tex]Multiply: [tex]\displaystyle 0.470031 \ mol \ CaF_2[/tex]Solution
Set up: [tex]\displaystyle 300 \ mL \ H_2O(\frac{1 \ L \ H_2O}{1000 \ mL \ H_2O})[/tex]Multiply: [tex]\displaystyle 0.3 \ L \ H_2O[/tex]Step 4: Find Molarity
Substitute [M]: [tex]\displaystyle x \ M = \frac{0.470031 \ mol \ CaF_2}{.3 \ L \ H_2O}[/tex]Divide: [tex]\displaystyle x = 1.56677 \ M[/tex]Step 5: Check
Follow sig fig rules and round. We are given 1 sig fig as our lowest.
1.56677 M ≈ 2 M
What most accurately explains whether liquid water or ice has a higher density, and why?
A) Ice has a higher density. Substances are always denser as solids than they are as liquids because the particles of solids have less energy to move and crowd closer together.
B) Liquid water has a higher density. Substances are always denser as liquids than they are as solids because the vibrations of solid particles create larger gaps between them.
C) Liquid water has a higher density. Ice crystals have an open hexagonal structure with some empty space in the middle, while liquid water does not.
D) Ice has a higher density. Solid ice has strong hydrogen bonds that hold the particles closer together, while liquid water does not form hydrogen bonds.
Answer:
I think your answer is either b or c but I think b is more likely to be your answer
Why does the mass of steel wool increase after getting burned? Help pls
Answer:
heat and large amount of surface area
Explanation:
the heat and surface area allows the iron in the wool to combine with oxygen. by doing this it increases the mass of the steel wool
The mass of steel wool increases after burning because it reacts with oxygen in the air, leading to the formation of iron oxide.
After burning, steel wool's bulk grows due to the oxidation process. Iron oxide, also referred to as rust, is created when steel wool burns when it comes into contact with oxygen from the air.
The steel's iron reacts chemically with the oxygen to create iron oxide, which is heavier than the original iron. As a result of going through the oxidation process and becoming iron oxide, steel wool gains bulk.
Learn more about oxidation, here:
https://brainly.com/question/13182308
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Which of the following were conclusions based on Rutherford's gold foil experiment? Choose ALL that apply.
A) atoms contain a nucleus
B) Electrons have a mass much greater than that of protons
C) the mass and positive charge of an atom is concentrated in a small space in the center of the atom
D) most of the atom is empty space
Answer:The alpha particles that were fired at the gold foil were positively charged. ... These experiments led Rutherford to describe the atom as containing mostly empty space, with a very small, dense, positively charged nucleus at the center, which contained most of the mass of the atom, with the electrons orbiting the nucleus.
Explanation:Thomson's cathode ray experiment and Rutherford's gold foil experiment. ... that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. ... mass of each particle was much, much smaller than that of any known atom. ... Why did Thomson conclude that electrons could be found in atoms of all elements?
Which of the following processes will contribute most tot he development of soil?
A. Absorbing of sunlight by plants
B. Migration of animals
C. Evaporation of ocean water
D. Weathering of rocks
Answer:
B - migration of animals
Weathering of rocks will contribute most to the development of soil.
Weathering is the process in which rock particles are broken down into
smaller parts.
The smaller parts results in soil formation and is carried out through
physical and chemical factors.
The physical factors include:
AbrasionThermal expansionFreezing and thawing of rocksThe chemical factors include:
CarbonationAcidification etcRead more about Weathering here https://brainly.com/question/829782
In the modern periodic table, which of the following represents the last pair of elects for which Newlands' Law of Octaves would hold true?
1. AI and GA
2. AI and SI
3. NE and AR
4. MG and CA
Answer: Mg and Ca
Explanation:
In the modern periodic table, Mg and Ca are the last pair of elects for which Newlands' Law of Octaves would hold true.
Law of Octaves is the generalization that was made by Newlands. It states that when chemical elements are arranged based on their increasing atomic weight, then the ones that have the same chemical and physical properties will occur after an interval of seven elements.
In such a case, every eighth element will have identical properties when the elements in the periodic table are arranged based on their atomic masses.
Based on the above information, Magnesium (Mg) has an atomic number of 12 while Calcium (Ca) has an atomic number of 20. Therefore, the elements follow the law of Octaves as they have a difference of 8 in their atomic numbers.
Read related link on:
https://brainly.com/question/16430105
What questions, if we were to answer them, would
help us figure out why our hands feel colder when
they are wet than when they are dry?
Answer:
When our bodies are dry and wind blows by, we lose some energy to the air molecules. When are bodies are wet, we have a substance on our skin that likes to absorb heat. So when wind blows by, we lose a LOT of energy to the air molecules. When the body loses heat energy, our body temperature drops.
Explanation:
hope it helps
plzz mark it as brainliest...
What is the asthenosphere?
Question 3 options:
The hot, rigid inner part of the upper mantle which can’t flow
The hot, weak inner part of the upper mantle which can flow
The hot, weak outer part of the lower mantle
None of the above
Answer:
None of the Above
Explanation:
The Athenosphere is able to flow but is also part of the UPPER LAYER meaning none of these choices are correct
(Please help, ASAP) How many grams are in 3.45x10^23 atoms of P?
one mole of P weights about 31 grams
in one mole there are 6.022*10^23 atoms
we use the rule of threes
6.022*10^23atoms......weight..........31 grams
3.45*10^23 atoms.........weight...........x grams
x=(3.45*10^23*31)/6.022*10^23
x=106.95/6.022=17.76 grams
Why are there multiple types of ramps in the park?
Answer:
Each person has their own skill level. The smaller ramps are less risky and are for more beginner to amateur skaters. The larger ones are very risky but can be very nice if a person does tricks with it. They are geared for more experienced skaters. Different ramps allow for more people to hace fun skating without the risk of injury...
Both prokaryotes and eukaryotes have small, free-floating organelles. The cell makes these organelles from nucleic acids and amino acids found in food. Without these organelles, the cell could not make proteins. What are these organelles called? A. chloroplasts B. mitochondria C. ribosomes D. vesicles
Answer:
C. ribosomes
Explanation:
Both prokaryotic and eukaryotic cells contain certain structures called ORGANELLES. They possess some in common and others are not found in one or the other. According to this question, a small, free-floating organelle made from nucleic acid and amino acid is found in both eukaryotes and prokaryotes. This organelle is RIBOSOMES.
Ribosomes are organelles responsible for the synthesis of protein in both eukaryotes and prokaryotes. They can be found free-floating or attached to endoplasmic reticulum. Ribosomes are predominantly made of RNA (nucleic acid) and proteins i.e. Ribosomal RNA (rRNA) and proteins is their structural constituent. Hence, the organelle in this question is RIBOSOME.
Consider the compounds Cl2, HCl, F2, NaF, and HF. Which compound has a boiling point closest to that of argon? Explain how you came up with your answer.
Answer:
Cl2, Chlorine molecule has a boiling point closest to that of argon.
This is because Chlorine is made up of discrete and simple molecules making up a simple molecular structure. The molecules associate through weak van der waal's forces of attraction hence low boiling point.
HCl has strong hydrogen bonds.
F2 is very small hence strong forces of attraction.
HF has strong hydrogen bonds
4. What are the PRODUCTS of the chemical reaction pictured?
+
CH4
+
202
CO2
+ 2H20
A. CHand CO2
O B. CO, and H2O
Answer:
CH4 =Methane (one atom of carbon and four atoms of hydrogen). It is a group-14 hydride and the simplest alkane and is the main constituent of natural gas.
202= Oxygen.
CO2= Carbon dioxide (one Carbon atom and two oxygen atom)
2H20= 2H2O means two molecules of water(H2O)
CH and CO2= the main difference between CO2 and CO2e is that CO2 only accounts for carbon dioxide, while CO2e accounts for carbon dioxide
CO= Carbon monoxide (CO), a colorless, odorless, and tasteless gas. Carbonyl group, composed of a carbon atom double-bonded to an oxygen atom: C=O.
H2O = water ( one hydrogen atom and two oxygen atoms)