Question

calculate the mass of 100 molecules of water ​

Answer 1

Answer:

2.989*10raised to negative 24 kg

Explanation:

H=1 , O=16

molecular mass of water is 18kg

one mole of water cantains 6.022*10^24 kg

there fore =18÷6.022*10^24*100=2.989*10‐24kg

Answer 2

Answer:

298.8×10^-23g

is the mass of 100 molecules of water.

Explanation:

The molecular weight of water is 18 g/mol. Hence, one mole of water weighs 18 g.

One mole of water contains 6.023×10^ -23

water molecules.

Mass of one water molecule = 18/ 6.023×10^23

=> 2.988×10^-23

Now after we have Find Mass of one molecule

we will just multiple this value by 100 because we need to find the mass of 100 water molecules

Hence, we get

2.988×10^-23 ×100

= 298.8×10^-23