Question

Q 6 a) Compute the number of calcium ion present in 20 grams of
calcium carbonate.
b) Calculate the mass of 12.044 x 10 20 molecules of oxygen?
c) Calculate the number of molecules of oxygen present in 8 grams of oxygen gas.
​

Answer 1

Answer:

For Helium,Number of atoms = Number of moles × 6.022 × 10^23 No of Moles = 12.044 × 10^236.022 × 10^23 = 2.Now, atomic mass of He = 4 Weight = 2 × 4 = 8 g