Atomic and Molecular Mass

Calculate the atomic mass of nitrogen assuming oxygen as the reference element.

In the nineteenth century, scientists could determine mass of one atom relative to another by experimental methods using Avogadro's hypothesis. Earlier, hydrogen was used as the reference element being the lightest atom, but the present system of atomic masses is based on carbon-$12$ as the standard and has been agreed upon in the year _____.

In the nineteenth century, scientists used to determine the absolute mass of an atom using technique called mass spectrometry.

Discuss the need of reference element in the calculation of atomic masses.

Which element is used as a reference element in the present system of atomic masses?

A gas mixture contains $50\raisebox{1ex}{$ o$}\!\left/ \!\raisebox{-1ex}{$o$}\right.$ helium and $50 \raisebox{1ex}{$o$}\!\left/ \!\raisebox{-1ex}{$o$}\right.$ methane by volume. What is the percentage by weight of methane in the mixture?

$0.304 \mathrm{g}$ of a silver salt of a dibasic acid left $0.216 \mathrm{g}$ of silver on ignition. Calculate its molecular weight of the dibasic acid.

A gas mixture contains $50\%$ helium and $50\%$ methane by volume. What is the percentage by weight of methane in the mixture?

An element X has the following isotopic composition:
${}^{200}\mathrm{X}:90\raisebox{1ex}{$ \mathrm{o}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{o}$}\right.$ ,  ${}^{199}\mathrm{X}:8.0 \raisebox{1ex}{$\mathrm{o}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{o}$}\right.$ ,   ${}^{202}\mathrm{X}:2 \raisebox{1ex}{$\mathrm{o}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{o}$}\right.$
The weighted average atomic mass of the naturally occurring element X is close to

Which is the correct gram molecular mass of ammonia?

Define gram molecular mass?

Atomic mass of an element expressed in _____ is called its gram atomic mass or gram atoms.

Which of the following elements has the same molecular mass as its atomic mass?

A gas mixture contains $50\raisebox{1ex}{$ o$}\!\left/ \!\raisebox{-1ex}{$o$}\right.$ helium and $50 \raisebox{1ex}{$o$}\!\left/ \!\raisebox{-1ex}{$o$}\right.$ methane by volume. What is the percentage by weight of methane in the mixture?

An element X has the following isotopic composition:
${}^{200}\mathrm{X}:90\raisebox{1ex}{$ \mathrm{o}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{o}$}\right.$ ,  ${}^{199}\mathrm{X}:8.0 \raisebox{1ex}{$\mathrm{o}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{o}$}\right.$ ,   ${}^{202}\mathrm{X}:2 \raisebox{1ex}{$\mathrm{o}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{o}$}\right.$
The weighted average atomic mass of the naturally occurring element X is close to

The chloroplatinate of a diacid base contains $39\%$ platinum. What is the molecular weight of the base? $(\mathrm{Pt}=195)$

$0.304 \mathrm{g}$ of a silver salt of a dibasic acid left $0.216 \mathrm{g}$ of silver on ignition. Calculate its molecular weight.

Average atomic mass of $\mathrm{Mg}$ is approximately equal to. (Given that percentage abudance of ${{12}^{\mathrm{Mg}}}^{24}$, ${{12}^{\mathrm{Mg}}}^{25}$ and ${{12}^{\mathrm{Mg}}}^{26}$ are $79\%, 10\% \mathrm{and} 11\%$, respectively)

What will be the effect on mass of one mole of substance, if we consider 1/6, in place of 1/12 of mass of carbon atom as relative atomic mass unit?