3. Natural gas is a mixture of several hydrocarbons, but is primarily methane. F

Question

3. Natural gas is a mixture of several hydrocarbons, but is primarily methane. Find the empirical formula of this important natural resource if it is composed of 74.8% carbon and 25.2% hydrogen. 4. While trace impurities of iron and chromium in natural corundum form the gemstones ruby and sapphire, it is a binary compound or aluminum and oxygen, with 52.9% Al. Find the empirical formula and give the chemical name for corundum. 5. Calculate the empirical formula of a compound that is made from 1.67 g of cerium and 4.54 g of iodine. 6. Dianabol is one of the anabolic steroids composed of only C, H, and O that has been used by some athletes to increase the size and strength of their muscles. A 14.765 g sample of Dianabol is burned, and 43.257 g CO2 and 12.395 g H:0 are formed. In a second experiment, the molecular mass of Dianabol is found to be 300.44 g/mol. What is the molecular formula for Dianabol? 51

Explanation / Answer

3)
we have mass of each elements as:
C: 74.8 g
H: 25.2 g


Divide by molar mass to get number of moles of each:
C: 74.8/12.01 = 6.2281
H: 25.2/1.008 = 25


Divide by smallest to get simplest whole number ratio:
C: 6.2281/6.2281 = 1
H: 25/6.2281 = 4

So empirical formula is:CH4

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