Q5 of 27 Page 46

Calculate the gram molecular mass/gram formula mass of the following.

Na2SO4


(Gram atomic masses H = 1 g, N = 14 g, O = 16 g, Na = 23 g, S = 32 g, Cl = 35.5 g, Ca = 40 g)

Na2SO4

Gram atomic mass of Na=11g


Gram atomic mass of S=32g


Gram atomic mass of O=16g


GMM of Na2SO4 = 2× 11g + 32g + 4× 16g


GMM of Na2SO4 = 22g + 32g + 64g


GMM of Na2SO4 = 118g


Thus, gram molecular mass of Na2SO4 is 118g


More from this chapter

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5

Calculate the gram molecular mass/gram formula mass of the following.

HNO3


(Gram atomic masses H = 1 g, N = 14 g, O = 16 g, Na = 23 g, S = 32 g, Cl = 35.5 g, Ca = 40 g)

 5

Calculate the gram molecular mass/gram formula mass of the following.

CaCl2


(Gram atomic masses H = 1 g, N = 14 g, O = 16 g, Na = 23 g, S = 32 g, Cl = 35.5 g, Ca = 40 g)

 5

Calculate the gram molecular mass/gram formula mass of the following.

NH4NO3


(Gram atomic masses H = 1 g, N = 14 g, O = 16 g, Na = 23 g, S = 32 g, Cl = 35.5 g, Ca = 40 g)

 6

Given below are a few samples.

a. 400 g of water (H2O)


b. 400 g of carbon (C)


c. 400 g of helium (He)


d. 400 g of hydrogen (H2)


e. 400 g of glucose (C6H12O6)


(i) Find the number of moles in each.


(ii) Arrange the samples in the increasing order of their number of moles.


(Gram molecular masses He = 4 g, C = 12 g, H2 = 2 g, H2O = 18 g, C6H12O6 = 180 g)