Question

An Olympic medal contains 71.5% of gold by mass. How much gold could be extracted from a medal that weighs 115 grams? 1. 82.2 mol 2. 0.817 mol 3. 0.417 mol 4. 31.7 mol 5. 14.1 mol 6. 1.33 mol

Answer 1

Answer:

0.417 mol could be extracted from a medal that weighs 115 grams

Explanation:

Our Olympic medal weighs 115 g and we know that 71.5% is gold so how much from this medal is gold?

100 % ____ 115 g

71,5 % ____ 82.22 g

Molar mass of Au is 196.97 g/m

Mass / Molar mass = Moles

82.22 g / 196.97 g/m = 0.417 moles