Moles And Stoichiometry Review: Question Preview (ID: 8707)

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Which is an empirical formula
a) C2H2
b) H2O
c) H2O2
d) C6H12O6

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) 6 moles
d) 9 moles

What is the gram formula mass of K2CO3.
a) 120 g
b) 138 g
c) 148 g
d) 150 g

In which type of reaction does a compound break down into 2 or more elements or simpler compounds
a) Synthesis
b) Decomposition
c) Single Replacement
d) Combusion

What is the empirical formula of the compound whose molecular formula is P4O10?
a) PO
b) PO2
c) P2O5
d) P8O20

What is the percent by mass of oxygen in magnesium oxide, MgO?
a) 20 %
b) 40 %
c) 50 %
d) 60 %

A compound is 86% carbon and 14% hydrogen by mass. What is the empirical formula for this compound?
a) CH
b) CH2
c) CH3
d) CH4

What is the percent by mass of water in the hydrate Na2CO3 * 10H2O (formula mass = 286)?
a) 6.89 %
b) 14.5 %
c) 26.1 %
d) 62.9 %

What is the total number of oxygen atoms in the formula MgSO4 * 7 H2O?
a) 11
b) 7
c) 5
d) 4

What quantity is equivalent to 39 g of LiF
a) 1.0 mole
b) 2.0 moles
c) 0.5 mole
d) 1.5 moles

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