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

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

it's c (engineer's do their work with mechanical stuff not on any living being)