Name: ___________________________________________ Grade: _____________
Homework 2: Analyzing Chemical Reactions
Submit before 15th April 2025
Read each question. Circle the letter of the correct answer.
1. In the reaction represented by the
equation: N2 + 3H2 → 2NH3, what is
the conversion factor of nitrogen to
ammonia?
A. 1:1
B. 1:2
4. For the reaction represented by the
equation Cl2 + 2KBr → 2KCl + Br2,
how many grams of potassium
chloride (KCl) can be produced from
300 g each of chlorine (Cl2) and
potassium bromide (KBr)? Refer to
the periodic table.
C. 1:3
A. 98.7 g
D. 2:3
B. 111 g
C. 188 g
2. For the reaction represented by the
equation C + 2H2 → CH4, how many
moles of hydrogen are required to
produce 10 mol of methane, CH4?
D. 600 g
A. 2 mol
B. 4 mol
C. 10 mol
D. 20 mol
3. For the reaction represented by the
equation 2H2 + O2 → 2H2O, how
many grams of water (H2O) are
produced from 6.00 mol of hydrogen
(H2)? Refer to the periodic table.
A. 2.00 g
B. 6.00 g
C. 54.0 g
D. 108 g
5. What is the definition of the molar
mass of an element or compound?
A. mass in grams of one mole
B. number of moles in one gram
C. mass in kilograms of one mole
D. number of moles in one kilogram
Qn. 7
6. What is the molar mass of lead (II)
nitrate, Pb(NO3) 2? Refer to the
periodic table.
B. 267.212 g/mol
During photosynthesis, carbon dioxide
reacts with water to form sugar with
oxygen as a byproduct as shown in
the chemical equation:
C. 269.204 g/mol
6CO2 + 6H2O → C6H12O6 + 6O2
A. 237.206 g/mol
What mass of sugar is formed when
44 grams of carbon dioxide react with
excess water? Refer to the periodic
table.
D. 331.208 g/mol
A. 4.1 grams
B. 30.0 grams
C. 180.0 grams
D. 1,320.0 grams
Read each statement. Write your answer on the lines.
8. A mole of carbon has a mass of 12.01 g, and a mole of aluminum has a mass of 26.98 g.
Define what a mole is in chemistry.
Use the definition to describe in what way 12.01 g of carbon and 26.98 g of aluminum
are equal.
Lesson 4.2 Homework 2
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9. Calculate the molar mass of each of the following substances. Show your working!
Al(OH)3
CCl4
(NH4)3PO4
K2Cr2O7
NaHCO3
CH3COOH
10. Calculate: Write the formula and show your working.
a) Find the mass present in 0.15 mol of white phosphorus (P).
b) Calculate the mass of sodium hydroxide (NaOH) present in 0.641 mol.
Lesson 4.2 Homework 2
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11. Calculate the following: with formula and show your working!
a) How many molecules of C3H8 are there in 7.21 mole of C3H8?
b) How many atoms of S are there in 6.89 x 10-4 mol of S?
c) How many moles of magnesium are 3.01 x 1022 atoms of magnesium Mg?
Lesson 4.2 Homework 2
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d) How many molecules are in 4.00 mol of glucose, C6H12O6?
e) Find the mass present in 5.85 x 1023 molecules of ammonia (NH3).
f) Determine the mass present in 4.75 x 1019 formula units of copper (II) nitrate
Cu(NO3)2.
Lesson 4.2 Homework 2
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