Question

Calculate the mass of 0. 4 moles of water.​

Answer 1

7.208 g

Step-by-step explanation:

0.4mol x
`(2(1.01) + 16.00 g)/(1 mol)`

= 7.208 g

You are using molar mass of H20 to find the mass. Moles of 0.4 and 1 mol cancel out leaving you with just grams. You get the values in the numerator from the periodic table and the 2(1.01) is because you have 2 of the H in H20