# Problem: A compound containing only sulfur and nitrogen is 69.6% S by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound?

###### FREE Expert Solution

We’re being asked to determine the molecular formula of a compound containing only sulfur and nitrogen is 69.6% S by mass. This means we need to do the following steps:

Step 1: Calculate the mass and moles of S and N in the compound.

Step 2: Determine the lowest whole number ratio of S and N to get the empirical formula.

Step 3: Get the ratio of the molar mass and empirical mass to determine the molecular formula.

Step 1: The compound is composed of S and N and we’re only given the mass percent of S (69.6% S). Recall that the mass percentages of a compound must add up to 100%. This means:

100% = %mass S + %mass N

100% = 69.6% + % mass N

% mass N = 100% – 69.6%

% mass N = 30.4%

Recall that mass percent is given by:

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###### Problem Details

A compound containing only sulfur and nitrogen is 69.6% S by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound?