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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: leah106 on June 11, 2012, 12:06:11 AM

Title: Problem Help: Finding Molecular Formula from Mass Percent
Post by: leah106 on June 11, 2012, 12:06:11 AM

Can someone explain how I should go about solving this? The answer is N₂H₄O₄, but I don't understand how to get that.

Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O. If its molar mass is between 94 and 98 g/mol, what is its molecular formula?

Title: Re: Problem Help: Finding Molecular Formula from Mass Percent
Post by: Hunter2 on June 11, 2012, 12:52:17 AM

Multipy the Percentage values with the Molecular weights and devide by the molecular weight of the Elements. 

Title: Re: Problem Help: Finding Molecular Formula from Mass Percent
Post by: Borek on June 11, 2012, 03:27:33 AM

For a more general approach google combustion analysis and empirical formula.