Q2 of 75 Page 58

Which one is a larger quantity molar mass or molecular mass? Explain.

Molar mass is the mass of one mole of substance, while molecular mass is the mass of one molecule of the substance. Molecular mass is the larger quantity because it contains the mass of one molecule (made up of atoms).


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6

Write the formula of the following compounds.

(i) Magnesium sulphate


(ii) Sodium bromide


(iii) Calcium chloride


(iv) Potassium nitrate


(v) Sodium phosphate

 1

How formula unit mass is different from molecular mass?

 3

Calculate the molar mass of the following compounds:

(i) MgO (ii) Na2CO3


(iii) H3PO4 (iv) Ca(OH)2


(v) Al2(SO4)3

 4

Predict the mass possessed by certain number of oxygen atoms which is equal to the number of molecules present 1g of hydrogen gas?