Question

Calculate the mass of 1×10^25 molecules of water?​

Answer 1

Mass = no. of molecules / 6.023 * 10^ 23 * Molar mass

Explanation:

Molar mass of CO2 = 44g/mol

1.5

⋅

10

25

6.023

⋅

10

23

= 51.5 moles of CO2

51.5

⋅

44g/mol

=

2266

g

r

a

m

s

 

Hope this helped

Answer 2

2.88×10^2

Explanation:

1×10^25=mole×6.022×10^23

mole=mass÷molar mass

mole=1×10^25÷6.022×10^23=0.16×10^2

mass=mole×molar mass

mass=0.16×10^2×18=2.88×10^2

I hope it can help you ☺️