Question: Hello, I need help explaining the steps of these 2 problems, I have the solution key but don't know how to solve the problem step

Hello, I need help explaining the steps of these 2 problems, I have the solution key but don't know how to solve the problem step by step:

1. How many grams of ethanol (C2H5OH) are present in a 25.0 g solution that contains 0.400 mole fraction acetone (CH3COCH3)?

the answer is ( mass of ethanol = 13.6 g)

2. What mass of cesium chloride (CsCl) must be added to 500. mL of water to produce a 0.400 molkg1 solution? The solution density is dsoln=1.00 gmL1 .

the answer is ( mass of CsCl = 33.7 g)

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