Calculate the mass of one `12_C` atom in gram.

Calculate the mass of 5 moles of CaCO_3 in grams.

Calculate the mass of one mole of electrons

67.2L of Carbon dioxide gas is filled in a cylinder at STP: Calculate the mass of CO_2 present in it. (Atomic mass-C=12,O=16)

A definite mass of CO_2 gas at STP has a volume of 67.2 Litre in a cylinder. a) Calculate the mass of CO_2 (Atomic mass, C - 12, O =16) b) Calculate the number of molecules of CO_2 in the cylinder.

NH_3 , gas at STP is kept in a cylinder of volume 5600mL. a) How many moles of NH_3 , is present in the cylinder? b) Calculate the mass of gas in the cyclinder. c) Find the number of molecules in the gas calculate the number of atoms in it. (Hint: Atomic mass, N=14, H-D)

Calculate the number of moles of of 0.72 gram of CO_2

Calculate the atomic mass of an element having cubic structure with one atom at each corner. The volume of the unit cell is 2.4xx10^(-23) cm^3 and density is 4.4 g cm^(-3 .

Calculate the mass of zinc required to produce 448 mL of H_2 at STP by reacting with dilute sulphuric acid (Atomic mass of Zn = 65).

One atom of an element X weighs 6.644 xx 10^(-23) g. Calculate the number of gram-atoms in 40 kg of it.

Calculate the molecular mass of the following? i. C_6H_(12)O_6 ii. HNO_3