The modern atomic weight scale is based on

When an element forms its oxide,oxygen constitutes $20\%$ of its weight in the oxide. What is the equivalent weight of the element?

Which of the following properties of an element is not variable?

$1 \, g$ of hydrogen is found to combine with $80 \, g$ of bromine. $1 \, g$ of calcium (valency $2$) combines with $4 \, g$ of bromine. The equivalent weight of calcium is

The oxide of a metal has $32\%$ oxygen. Its equivalent weight would be

What is the weight of $1$ atom of $H$ in grams? (Atomic mass of $H = 1.008$)