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 data:

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.