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

Weigh less than 61.9 g

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.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.