Calculate the mass of 12.044 × 1025 molecules of oxygen (O2).

One mole of O2 = 32 gm6.022 × 1023 molecules of O2 have mass = 32 gmSo, 12.044 × 1025 molecules of O2 will have mass = 6400 gm = 6.4 Kg

Q13 of 203 Page 172

Calculate the mass of 12.044 × 10²⁵ molecules of oxygen (O₂).

One mole of O₂ = 32 gm

6.022 × 10²³ molecules of O₂ have mass = 32 gm

So, 12.044 × 10²⁵ molecules of O₂ will have mass = 6400 gm = 6.4 Kg

What name is given to this number?

What name is given to the amount of substance containing this number of atoms?

What is the number of molecules in 1.5 moles of ammonia?

How many moles of calcium carbonate (CaCO₃) are present in 10 g of the substance? (Ca = 40 u; C = 12 u; O = 16 u)