Avogadro's number was calculated by determining the number of atoms in
a. 12.00 g of carbon-12
b. 14.00 g of carbon-12
c. 12.00 g of oxygen
d. 14.00 g of oxygen

Answer : The correct option is A.

Explanation :

One mole of substance means the amount of substance that contains as many particles in pure substance. So, one mole contains of particles. And this is also known as Avogadro's number.

Molar mass of carbon = 12 g/mole

Molar mass of oxygen = 16 g/mole

Moles of carbon-12 =

Moles of carbon-12 =

Moles of oxygen =

Moles of oxygen =

Therefore, the only option A which contain 1 mole.

a) the particles of the chair are strongly held together.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.