Question

1. convert 15.8 moles of calcium to grams.

Explanation:

Step1: Recall the formula

The formula to convert moles to grams is \(m = n\times M\), where \(m\) is mass in grams, \(n\) is the number of moles, and \(M\) is the molar mass. The molar mass of calcium (\(Ca\)) is \(M = 40.08\space g/mol\).

Step2: Substitute the values

Given \(n = 15.8\space mol\) and \(M=40.08\space g/mol\), substitute into the formula: \(m=15.8\times40.08\).

Step3: Calculate the result

\(15.8\times40.08=(16 - 0.2)\times40.08=16\times40.08-0.2\times40.08\)
\(16\times40.08 = 641.28\), \(0.2\times40.08 = 8.016\)
\(m=641.28- 8.016=633.264\space g\)

Answer:

\(633.264\space g\)