Calculate the number of moles in each of the following.
(i) 392 g of sulphuric acid
(ii) 44.8 litres of sulphur dioxide at N.T.P.
(iii) 8g of calcium
Answers
Answer:
Number of moles = Mass of substance / Mass of one mole.
(i)4 mol
(ii)2 mol
(iii)0.2 mol
Explanation:
(i)molar mass of H2HSO4=98 g
98 g H2HSO4=1 mol
392 g of H2HSO4=(1 mol/98 g)*(392 g)
= 4 mol
(ii)22.4 L of S02 at NTP=1 mol
44.8 L of S02 at NTP=(1 mol/22.4 L)*44.8 L)
= 2.0 mol
(iii)atomic mass of Ca=40 g
40 g of calcium=1 mol
8 g of calcium=(1 mol)*(8g/40 g)
=0.2 mol
Number of moles = Mass of substance / Mass of one mole.
(i)4 mol
(ii)2 mol
(iii)0.2 mol
Explanation:
(i)molar mass of H2HSO4=98 g
98 g H2HSO4=1 mol
392 g of H2HSO4=(1 mol/98 g)*(392 g)
= 4 mol
(ii)22.4 L of S02 at NTP=1 mol
44.8 L of S02 at NTP=(1 mol/22.4 L)*44.8 L)
= 2.0 mol
(iii)atomic mass of Ca=40 g
40 g of calcium=1 mol
8 g of calcium=(1 mol)*(8g/40 g)
=0.2 mol