Question

Some good estimates about the human body can be made if it is assumed that we are made mostly of water. The mass of a water molecule is 2.99 * 10^-26 kg. If the mass of a person is 62 kg, estimate the number of water molecules in that person.

Answer 1

Answer:

Explanation:

Given

mass of water molecule $m=2.99\times 10^{-26}\ kg$

mass of person $M=62\ kg$

It is given that body is mostly made up of water

suppose n water molecules constitutes 62 kg

so $n\times m=M$

$n=\frac{62}{2.99\times 10^{-26}}$

$n=20.73\times 10^{26}\ kg$