Question

A sample of V weighs 61.9 grams. Will a sample of He that contains the same number of atoms weigh more or less than 61.9 grams

Answer 1

Weigh less than 61.9 g

Step-by-step explanation:

The symbol V represents the element Vanadium and He represents Helium.

Generally, 1 mol of any atom contains 6.022 * 10^23 atoms. This means we have to find the number of moles of each elements.

For V;

Number of moles = Mass / Molar mass = 61.9 / 50.94 = 1.215 mol

1 mol = 6.022 * 10^23 atoms

1.215 = x

Number of atoms = 6.022 * 10^23 * 1.215 =7.317 * 10^23

For He;

Since equal number of moles contain equal number of atoms;

Number of mol of He = 1.215 mol

Number of moles = Mass / Molar mass

Mass = Molar mass * Number of moles = 4 * 1.215 = 4.86 g

This means it would weigh less.