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Moles And Stoichiometry Review
Test Description: Review of Moles and Stoichiometry
Instructions: Answer all questions to get your test result.
1) Which is an empirical formula
A
C6H12O6
B
H2O
C
H2O2
D
C2H2
2) CH4 + 2 O2 --> CO2 + 2 H2O. How many moles of oxygen are needed to completely react with 3 moles of CH4.
A
3 moles
B
2 moles
C
9 moles
D
6 moles
3) What is the gram formula mass of K2CO3.
A
120 g
B
148 g
C
150 g
D
138 g
4) In which type of reaction does a compound break down into 2 or more elements or simpler compounds
A
Combusion
B
Single Replacement
C
Synthesis
D
Decomposition
5) What is the empirical formula of the compound whose molecular formula is P4O10?
A
P2O5
B
P8O20
C
PO
D
PO2
6) What is the percent by mass of oxygen in magnesium oxide, MgO?
A
50 %
B
20 %
C
40 %
D
60 %
7) A compound is 86% carbon and 14% hydrogen by mass. What is the empirical formula for this compound?
A
CH3
B
CH
C
CH2
D
CH4
8) What is the percent by mass of water in the hydrate Na2CO3 * 10H2O (formula mass = 286)?
A
14.5 %
B
26.1 %
C
6.89 %
D
62.9 %
9) What is the total number of oxygen atoms in the formula MgSO4 * 7 H2O?
A
5
B
4
C
11
D
7
10) What quantity is equivalent to 39 g of LiF
A
0.5 mole
B
2.0 moles
C
1.0 mole
D
1.5 moles
*select an answer for all questions
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