Explain the need of term Average atomic mass.

Define:Average rate of chemical reaction. OR Explain : the term Average rate of chemical reaction

Calculate the number of moles of magnesium oxide, MgO in 80 g of the compound. (Average atomic masses of Mg =24 and O =16)

Calculate the number of moles of magnesium oxide, MgO in 10 g of the compound. (Average atomic masses of Mg =24 and O =16)

Explain the term: Periderm

Answer the following : Explain the need for thermometer .

Explain the term: Endarch

Explain the term: Cambium

Explain the terms. Gangue

Calculate number of atoms in each of the following (Average atomic mass : N = 14 u,S=32 u) 0.4 mole of nitrogen