Question

type the correct answer in the box. tungsten carbide is becoming popular for making jewelry. a chemist is examining a sample of tungsten carbide (chemical formula wc). what is the percent composition of tungsten in this compound? round your answer to the nearest whole percent. the percent composition of tungsten is (\boxed{}) %. reset next

Explanation:

Step1: Find molar masses

Molar mass of W (tungsten) is $M_W = 183.84\ \text{g/mol}$, molar mass of C (carbon) is $M_C = 12.01\ \text{g/mol}$. For WC, molar mass of WC is $M_{WC}=M_W + M_C=183.84 + 12.01 = 195.85\ \text{g/mol}$.

Step2: Calculate percent composition

Percent composition of W is $\frac{M_W}{M_{WC}}\times100\%=\frac{183.84}{195.85}\times 100\%$.
Calculate $\frac{183.84}{195.85}\approx0.9386$, then $0.9386\times 100\% = 93.86\%$, round to nearest whole percent is $94\%$.

Answer:

94