Question

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

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 of the substance and \(M\) is the molar mass. The molar mass of sulfur (\(S\)) is \(M = 32.065\space g/mol\).

Step2: Substitute the values into the formula

We are given \(m = 42.1\space g\) of \(S\). Substituting into the formula \(n=\frac{m}{M}\), we get \(n=\frac{42.1\space g}{32.065\space g/mol}\).

Answer:

\(1.313\space mol\) (calculated as \(\frac{42.1}{32.065}\approx1.313\))