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by BlastRoom
Practice finding simplest ratios and scaling empirical formulas to molecular formulas.
#chemistry
20 questions
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A compound is 40.0% C, 6.7% H, and 53.3% O by mass. What empirical formula matches the composition?
Elemental analysis of a nitrogen oxide gives 30.4% N and 69.6% O by mass. Which empirical formula is supported?
A rust-colored iron oxide is 69.9% Fe and 30.1% O by mass. Find its empirical formula.
A hydrocarbon sample is 85.7% C and 14.3% H by mass. What is the simplest whole-number formula?
Percent composition for an alcohol-like compound is 52.2% C, 13.0% H, and 34.8% O. Which formula is empirical?
An oxide of sulfur contains 40.1% S and 59.9% O by mass. Which empirical formula results from the mole ratio?
A copper chloride sample is 47.3% Cu and 52.7% Cl by mass. Choose its empirical formula.
A potassium oxide analyzes as 83.0% K and 17.0% O by mass. What is the empirical formula?
A compound contains 4.80 g C and 1.20 g H. Using C=12.01 g/mol and H=1.008 g/mol, what is the empirical formula?
A sample contains 5.58 g Fe and 1.60 g O. Using Fe=55.85 g/mol and O=16.00 g/mol, which empirical formula fits?
In a sodium oxide sample, 4.60 g Na combines with 1.60 g O. Using Na=22.99 g/mol and O=16.00 g/mol, what is the empirical formula?
A white solid contains 2.43 g Mg and 1.60 g O. Using Mg=24.31 g/mol and O=16.00 g/mol, find the empirical formula.
Using N = 14.01 g/mol and H = 1.008 g/mol, a compound has empirical formula NH2 and molar mass 32.05 g/mol. What is its molecular formula?
The empirical formula of a phosphorus oxide is P2O5; its empirical formula mass is 141.94 g/mol and molar mass is 283.88 g/mol. Which is molecular?
A hydrocarbon has empirical formula CH, empirical formula mass 13.02 g/mol, and molar mass 78.11 g/mol. Select the molecular formula.
The empirical formula is C3H4, the empirical formula mass is 40.06 g/mol, and the molar mass is 120.19 g/mol. What molecular formula follows?
A compound's empirical formula is C2H4O, its empirical formula mass is 44.05 g/mol, and its molar mass is 88.10 g/mol. What is its molecular formula?
Reduce the molecular formula C2H6O2 to its empirical formula.
What empirical formula has the same atom ratio as C6H10O4 but uses the smallest whole numbers?
Which formula is the simplest ratio for the molecular formula C8H10N4O2?
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Mole-Mole Stoichiometry
24 questions
