Molecular Mass

Which of the following molecules is triatomic?

In which of these elements is the mass of $1$ mole atom equal to the mass of $1$ mole molecule?

What is the unit for molar mass?

The atomic mass of four elements are given below:

Molar mass is the mass of $1$ mole of an element or a compound. Which element has the highest molar mass?

Calculate the masses of sugar and water required to prepare $200\mathrm{g}$ of $15\%$ mass by mass of solution of sugar in water.

Which of the following statement is incorrect?

Which of the following has the smallest mass?

A complex of iron contains $45.6\%$ iron by mass. Find out the number of iron atoms in $5.00 \mathrm{g}$ of this complex

A student wants to have $3.011\times {10}^{23}$ atoms each of magnesium and carbon elements. For this purpose, how much magnesium and carbon will he weigh in grams? 

The ratio of moles of atoms in $12$ g of magnesium and $16$ g of sulphur will be:

How many ${\mathrm{O}}_2$ molecules are there in one mole of oxygen gas?

The mass of one atom of chlorine is _____$\times {10}^{-23}\mathrm{gms}$. Avogadro number is $6.023\times {10}^{23}$.

(Write the value with four significant figures)

Which of the following correctly represents $360 \mathrm{g}$ of water?

$\left(i\right) 2$ moles of ${\mathrm{H}}_2\mathrm{O}$

$\left(ii\right) 20$ moles of water

$\left(iii\right)$ $6.022 \times {10}^{23}$ molecules of water

The molar mass of ${\mathrm{H}}_2\mathrm{O}$ is 18 g/mol. What is the number of moles in 90 g water? 

The number of moles in $36$ grams of water $\left({\mathrm{H}}_2\mathrm{O}\right)$ is _____. (one / two / three)

Which of the following has maximum number of atoms?

The formula of ethanol is ${\mathrm{C}}_2{\mathrm{H}}_5-\mathrm{OH}$. Its molecular mass is

Buckminsterfullerene is an allotrope of carbon in which atoms of carbon form pentagonal and hexagonal rings which are joined together to form a football-like round structure. Its molecular formula is ${\mathrm{C}}_{60}$. The molar mass of buckminsterfullerene and the number of atoms in one gram molecule of it are:

The mass of one atom of oxygen is _____ $\times {10}^{-23} \mathrm{g}$.$(2.657/0.265)$

The number of atoms present in $64$ g of ${\mathrm{S}}_8$  is $12.04\times {10}^{23}$.