Oxygen contains $90\%$ of $^{16}O$ and $10\%$ of $^{18}O$. Its atomic mass is

The $2\,N$ aqueous solution of $H_2SO_4$ contains

The phosphate of a metal $M$ has the formula $M_3(PO_4)_2$. What is the formula for its sulphate?

If $1.0 \ g$ of a metal combines with $8.89 \ g$ of bromine,what is the approximate equivalent weight of the metal? (Given: Atomic weight of $Br = 80 \ g/mol$)

The specific heat of a metal is $0.031 \ cal \ g^{-1} \ ^\circ C^{-1}$ and its equivalent weight is $103.6$. What is the exact atomic weight of the metal?

Elements $A$ and $B$ form two compounds $B_2A_3$ and $B_2A$. $0.05$ moles of $B_2A_3$ weigh $9.0 \ g$ and $0.10$ mole of $B_2A$ weigh $10 \ g$. The atomic weights of $A$ and $B$ are: