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EF MF and Percent Comp Quiz
Terms in this set (12)
the percent by mass (relative amount) of each element in a compound, or part of a mixture
An 8.20g piece of Mg combines completely with 5.40g of O to form a compound. What is the percent composition of this compound?
Calculate the % composition of carbon in propane, C3H8
80 % C
Calculate the mass of carbon in 8.34g of methane, CH4
The lowest whole number ratio of the elements in a compound
Caffeine has the following percent composition: carbon 49.48%, hydrogen 5.19%, oxygen 16.48% and nitrogen 28.85%. What is its empirical formula?
molecular formula (may or may not be empirical formula
The actual numbers of atoms of each element that occur in the smallest freely existing unit or molecule of the compound
n= molar mass/empirical formula mass
What is the molecular formula of a compound with the empirical formula of C2H6N. The compound has a molar mass of 88g.
(54.5 % C, 13.6 %H, and 31.8 % N)
What is the percent by mass of hydrogen in aspirin, C9H8O4?
52.7% carbon 47.3% chlorine
32.4% sodium 22.5% sulfur 45.1% oxygen
40.0%carbon 6.7% hydrogen 53.3% oxygen 60g/mol
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