Question

the chemical formula for magnesium sulfide is mgs.
a chemist determined by measurements that 0.075 moles of magnesium sulfide participate in a chemical reaction. calculate the mass of magnesium sulfide that participates.
be sure your answer has the correct number of significant digits.
g

Explanation:

Step1: Calculate the molar mass of MgS

The molar mass of Mg is \(24.31\space g/mol\), and the molar mass of S is \(32.07\space g/mol\).
The molar mass of \(MgS\) is \(M = 24.31+32.07=56.38\space g/mol\)

Step2: Use the formula \(m = n\times M\)

Given \(n = 0.075\space mol\) and \(M = 56.38\space g/mol\)
\(m=0.075\times56.38 = 4.2285\space g\)

Step3: Round to the correct number of significant digits

The number \(0.075\) has two significant digits. So, \(m = 4.2\space g\)

Answer:

\(4.2\space g\)