Question

deduce the number of molecules of
a.)32g of oxygen
b.)90g of water
c.)8.8g of carbon dioxide
d.)7.1g of chlorine

Answer 1

1 mole = 6.023*10²³
a) Moles of 32g oxygen = 32/16 = 2 moles
= 12.046*10²³ molecules
b) Moles of 90g water = 90/18 = 5 moles
= 30.115*10²³ molecules
c) Moles of 8.8g carbon dioxide = 8.8/12 = 0.73 mole
= 4.396*10²³ molecules
d) Moles of 7.1g chlorine = 7.1/35.5 = 0.2 mole
= 1.20*10²³ molecules

Note:- No. of moles = Given mass/Molar mass