The molecular weight of a gas is $45$. Its density at $STP$ is

The molar solution of sulphuric acid is equal to:

What is the normality of $1.5 \ M \ H_3PO_4$ (in $.5$)?

The reaction of $1 \ mol$ of magnesium nitride with excess water gives:

How many grams of ethanol are required to obtain $280 \ mL$ of dihydrogen gas at $S.T.P.$ by the reaction of $C_2H_5OH$ with $Na$ metal? (Molar mass of ethanol = $46 \ g/mol$)

Molarity of $0.2 \ N \ H_2SO_4$ is