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WorksheetsAsynchronous Review in Chemistry 1
Total questions: 8
Worksheet time: 4mins
For the compound calcium hydroxide, Ca(OH2), what is the percent composition of Ca?
54.05%
45.50%
55.40%
44.55%
Calculate the percent composition of carbon in CH3COOH.
42%
38%
40%
35.5%
Molecular formula is also called the "true" formula.
True
False
The mineral mimetite has a chemical formula of Pb5(AsO4)3Cl. What is the percent by mass of oxygen?
20.19%
15.15%
10.11%
12.90%
Gregor Mendel coinded the law of conservation of mass.
True
False
Which of the following is NOT needed in solving the average atomic mass of an element?
Percent Abundance of Isotopes
The known isotopes of the element
Number of protons of the said element
Atomic mass of the isotopes
How many moles of Au are there in a 25.5 g sample of Au?
1.01 x 10-2 mol Au
1.54 x 10-1 mol Au
1.29 x 10-1 mol Au
12.9 x 10-1 mol Au
A compound is 75.46% carbon, 4.43% hydrogen, and 20.10% oxygen by mass. It has a molecular weight of 318.31 g/mol. What is the molecular formula for this compound?
C10H14O4
C20H14O4
C10H7O2
C10H14O2
