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WorksheetsStoichiometry Part 1 Exam
Total questions: 20
Worksheet time: 2hrs 47mins
What is the gram formula mass of (NH4)3PO4?
Round to the nearest whole number.
(a)
What is the gram formula mass of Li2SO4?
Round to the nearest whole number.
(a)
Which is an empirical formula of a compound?
Al
C3H3
H2O
C6Hl2O6
Which formula below is an empirical formula?
NH3
C2H6
Hg2Cl2
H50O25
What is the empirical formula of a compound with the molecular formula C6H12O6?
C12H24O12
C3H6O3
C2H4O2
CH2O
The formula H2O2 is an example of
A structural formula
A molecular formula
An empirical formula
An ionic formula
A compound has the empirical formula CH and a molecular mass of 78. What is the molecular formula of the compound?
(a)
What is the molecular formula of a compound with the empirical formula P2O5 and a gram formula mass of 284 grams?
(a)
A compound has a gram formula mass of 56 grams. What is the molecular formula for this compound?
CH2
C2H4
C3H6
C4H8
A compound has an empirical formula of HCO2 and a molecular mass of 45 grams. What is the molecular formula of this compound?
(a)
What is the empirical formula of Al2O3?
(a)
Determine the gram-formula mass of stearic acid, C17H35COOH.
(a)
What is the approximate percent composition by mass of CaBr2 (gram formula mass = 200)?
20% calcium and 80% bromine
25% calcium and 75% bromine
30% calcium and 70% bromine
35% calcium and 65% bromine
What is the percent composition by mass of sulfur in the compound MgSO4?
20%
27%
46%
53%
What is the percent composition by mass of sulfur in Al2(SO4)3 (gram-formula mass = 342 grams/mole)?
28%
16%
56%
9%
What is the percent composition by mass of nitrogen in (NH4)2CO3 (gram-formula mass = 96.0 g/mol)?
14.6%
29.2%
58.4%
87.5%
A compound consists of 14.6% carbon and 85.4% chlorine by mass. What is the empirical formula?
CCl
CCl2
CCl3
CCl4
What is the empirical formula of a compound consisting of 29.6% oxygen and 70.4% fluorine by mass?
(a)
A compound was analyzed and found to contain 24% C, 4% H, and 72% Cl. What is the empirical formula of the compound?
CH2Cl
CHCl
C24H4Cl72
C6HCl18
Mercury forms a compound with chlorine that is 73.9% mercury and 26.1% chlorine by mass. What is the empirical formula?
(a)
