Calculate number helium atoms in 52 u of it?

The number of atoms in 4.25g of NH₃ is approximately

Assuming fully decomposed, the volume of CO₂ released at STP on heating 9.85 g of BaCO₃ (atomic mass, Ba = 137) will be

Calculate the amount of carbon dioxide that could be produced when 1 mole of carbon is burnt in air?

The molecular weight of O₂ and SO₂ are 32 and 64 respectively. At 15^oC and 150 mmHg pressure, 1 L of O₂ contains ' N ' molecules. The number of molecules in 2 L of SO₂ under the same conditions of temperature and pressure will be

__________is a substance which is made up of only one kind of atoms.

Calculate the mass of sodium acetate (CH3COONa) required to make 500 ml of 0.375 molar aqueous solution? Molar mass of sodium acetate is 82.02458 mol^-1

Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (atomic weight = 78.4), then minimum molecular weight of peroxidase anhydrase enzyme is