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WorksheetsChemical Formulas
Total questions: 23
Worksheet time: 49mins
What is the percent composition by mass of sulfur (S) in the compound MgSO4?
20.22%
19.85%
26.64%
28.64%
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
NaPO2
Na2PO3
Na3PO4
NaPO4
Calculate the molar mass of Cu2O.
37.55 g/mol
45.01 g/mol
79.55 g/mol
143.10 g/mol
How many moles are in 225g of CO?
8.03 mole
28.01 mole
4.82x1024 mole
7.50 mole
A sample of Al2(SO4)3 is made up of what percentage of aluminum?
7.9% Al
15.8% Al
64.1% Al
35.8% Al
How many moles of K2SO4 would have a mass of 50.0 g?
0.287 mol
8710 mol
3.01 x 1025 mol
1.73 x 1023 mol
What is the mass percentage of Carbon in Carbon dioxide (CO2)?
27.3% C
42.9% C
72.7% C
36.4% C
What is the mass in grams of 0.890 mol of CaCl2?
111 grams
0.00802 grams
98.8 grams
67.2 grams
A substance is found to have a molar mass of 128.18 g/mol and an empirical formula of C5H4, determine the molecular formula of the substance.
C5H4
C10H8
C15H12
C20H16
How many molecules are in 2.5 mol of N2O5?
4.15 x 10-24 molecules
4.48 x 10-22 molecules
1.39 x 1022 molecules
1.51 x 1024 molecules
How many grams are in 1.2 x 1024 molecules of CO?
28 grams
56 grams
6.02 grams
1.2 grams
