an unknown compound contains 14.00% copper, 31.76% carbon, 4.89% hydrogen, and the rest is oxygen.\nwhat…

an unknown compound contains 14.00% copper, 31.76% carbon, 4.89% hydrogen, and the rest is oxygen.\nwhat quantity in moles of hydrogen are present in 100.0 g of the compound?

an unknown compound contains 14.00% copper, 31.76% carbon, 4.89% hydrogen, and the rest is oxygen.\nwhat quantity in moles of hydrogen are present in 100.0 g of the compound?

Answer

Explanation:

Step1: Determine mass of hydrogen

Given 4.89% hydrogen in 100.0 g compound, so mass of hydrogen $m = 100.0\ g\times4.89%=4.89\ g$.

Step2: Calculate moles of hydrogen

Use molar - mass formula $n=\frac{m}{M}$, molar mass of hydrogen $M = 1.01\ g/mol$. So $n=\frac{4.89\ g}{1.01\ g/mol}\approx4.84\ mol$.

Answer:

4.84 mol