Question

a sample contains 7.90 g c and 42.1 g s. you want to determine the empirical formula. how many moles of c are in the sample? ? mol c do not round your answer. mol c

Explanation:

Step1: Recall the formula for moles

The formula for calculating the number of moles \(n\) is \(n=\frac{m}{M}\), where \(m\) is the mass and \(M\) is the molar mass. The molar mass of carbon \(M = 12.01\space g/mol\).

Step2: Calculate the moles of \(C\)

Given \(m = 7.90\space g\) and \(M=12.01\space g/mol\), then \(n=\frac{7.90}{12.01}\).

Answer:

\(0.657785\)