What is the mass in grams 4.78x10^24 No2 molecules

4.78 * 10²⁴ molecules of NO₂ have 365.2 g

Explanation:

The given problem will solve by using Avogadro number.

It is the number of atoms, ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 * 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 * 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 * 10²³ atoms of hydrogen

Given dа ta:

Number of molecules of NO₂ = 4.78 * 10²⁴ molecules

Mass in grams = ?

Solution:

46 g of NO₂ = one mole = 6.022 * 10²³ molecules

46 g/6.022 * 10²³ molecules * 4.78 * 10²⁴ molecules

7.64 g * 10⁻²³ * 4.78 * 10²⁴

365.2 g

4.78 * 10²⁴ molecules of NO₂ have 365.2 g.