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## Homework Statement

A runner weighs 687 N and 71% of this weight is water. (a) How many moles of water are in the runner's body? (b) How many water molecules (H2O) are there?

## Homework Equations

n = N/N

_{A}

n= m/mass per mole

N

_{A}= 6.022E23

F=ma

H: 2*1

O: 16

## The Attempt at a Solution

a)

687/9.8=70.1 g

70.1 * .71 = 49.77 g of h20

49.77/18 u = 2.765

b) 6.022E23 * 2.765 = 1.665