How many moles of phosphoric acid are there in 658 x 10 28 formula units
of phosphoric acid, H3PO4

109.3 × 10⁵ mol

Explanation:

Given data:

Number of moles of phosphoric acid = ?

Number of formula units = 658 × 10²⁸

Solution:

The given problem will solve by using Avogadro number.

The number 6.022 × 10²³ is called Avogadro number.

1 mole contain 6.022 × 10²³ formula units,

658 × 10²⁸ formula units × 1 mol / 6.022 × 10²³ formula units

109.3 × 10⁵ mol

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