(i) Calculate the molecular mass of CaCO3 (At mass Ca = 40 u, C = 12 u, O = 16 u)
(ii) Verify by calculating that
(a) 5 moles of CO2 and 5 moles of H2O do not have the same mass
(b) 240 g of calcium and 240 g of magnesium elements have a mole ratio of 5:3
(At mass H = 1u, Ca = 40u, Mg = 24u)
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1) 40+12+16*3
40+12+48= 100
so 100 is molecular mass
2) a. no. of mole = mass /molar mass
no. of mole in co2 is 5
molar mass of co2 is 44
from formula
mass = 44*5 = 220
no. of mole of h2o is 5
molar mass is 18
so mass = 18*5 = 90
so by see above mass are not equal
40+12+48= 100
so 100 is molecular mass
2) a. no. of mole = mass /molar mass
no. of mole in co2 is 5
molar mass of co2 is 44
from formula
mass = 44*5 = 220
no. of mole of h2o is 5
molar mass is 18
so mass = 18*5 = 90
so by see above mass are not equal
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