Q7 of 27 Page 46

Calculate the following.

Number of moles in 1 kg of water.


(GMM/GFM: H2O - 18 g, CaCO3 - 100 g, CO2 - 44 g, NH3 - 17 g)

Given: Mass of water = 1kg =1000g

Gram molecular mass of H2O = 18g


To calculate the number of moles, apply the formula given:




Number of moles = 55.5


Thus, number of moles in 1 kg of water is 55.5


More from this chapter

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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)

 7

Calculate the following.

Number of moles in 500 g of CaCO3.


(GMM/GFM: H2O - 18 g, CaCO3 - 100 g, CO2 - 44 g, NH3 - 17 g)

 7

Calculate the following.

Number of molecules and total number of atoms in 88 g of CO2.


(GMM/GFM: H2O - 18 g, CaCO3 - 100 g, CO2 - 44 g, NH3 - 17 g)