Question

1. Calculate the number of molecules in 50g of CaCO3. [atomic mass of Ca=40u, C=12u, O=16u]​

Answer 1

Answer:

= 44 g mole-1

mass of 10 moles of CO2 = 10 mole x 44 g mole-1

= 440 g

(iii) Number of He atoms = Given mass of Helium _

Mass of 1 atom of Helium

= 100

4

= 25

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