MCQ
Modern atomic mass scale is based on the mass of:
- AH −1
- BC −12
- CC −14
- DC −16
Explanation:
Modern atomic weight scale is based on C −12.
The standard unit for expressing the mass of atom is amu (atomic mass unit).
It is equal to $\frac{1}{12}$ of the mass of an atom of carbon -12 equal to 1.6605 × 10−19g.
Amu is also called as avogram.
Avogram is a unit of mass and weight equal to one gram divided by the Avogadro's number.
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$X \rightleftharpoons Y + Z - - - - - - \left( 1 \right)$
$A \rightleftharpoons 2B - - - - - - \left( 2 \right)$
are in ratio of $9 :1$. If degree of dissociation of $X$ and $A$ be equal, then total pressure at equilibrium $(1)$ and $(2)$ are in the ratio
${A_2}B(g) \to {A_2}(g) + B(g);\,\,\,\Delta {H^o} = 40\,kJ/mol$
${A_2}B(g) \to A(g) + AB(g);\,\,\,\Delta {H^o} = 50\,kJ/mol$
.....$ kJ/mol$