Whoever awser right I will give you

Sylvanite is a mineral that contains 28.0% gold by mass. how much sylvanite would you need to dig up to obtain 77.0 g of gold? explain how you got your answer and the steps you took. you

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

Ineed ! i have no clue how to do this problem.