1. Calculate the number of moles in the following:
a) 322g of Na2So4.10H2O [At Mass Na=23u,S=32u,O=16u,H=1u]
b) 900g of C6H12O6[At Mass of C=12u]
Answers
Answered by
0
a answer is -1 mole in na2so4. 10h2o
Answered by
8
(A) mass of Na2SO4.10H2O
Atomic mass of sodium= 23u
Atomic mass of sulphur=32u
Atomic mass of oxygen=16u
Atomic mass of hydrogen=1u
= (23×2+32+16×4) + 10 (1×2+16)
= (46+32+64) +10 (2+16)
= 142 + 10 (18)
= 142 + 180
= 322u
Now given mass = 322g
Molar mass = 322g
No. Of moles = given mass÷ molar mass = 322÷322 = 1mole
(B) mass of C6H12O6
Atomic mass of carbon=12u
Atomic mass of hydrogen=1u
Atomic mass of oxygen=16u
=12×6+1×12+16×6
=72+12+96
=180u
Now given mass=900g
Molar mass=180g
No. Of moles = given mass ÷ molar mass = 900 ÷180 = 5 moles
Hope it helps u
Plz mark it as brainlist
Similar questions