1. Solve for the MM and % of each element.
CH3COOH
NH4NO3
C11H22O11
2. what would be the mass of 15.00×10^21 atoms of Cobalt?
3.The empirical formula of a compound is SiH3. If 0.0275 mol of compund has a mass of 1.71g, what is the compound's molecular formula?
4.What's the persentage of water in CuSO4·5H2O?
5. A compound contains 58.5% C, 7.3%H and 34.1% N. What is the formula of the compound?
Answer Key （偽）
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Answer Key
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a) C 40% H 6.7% O 53.3%
b) N 35% H 5.0% O 60%
c) C 40% H 6.7% O 53.3%
2. 1.47g
3. Si2H6
4. 36.1%
5. C2H3N