How many moles of hydrogen gas (H2) are required to react completely with 0.75 moles of nitrogen gas (N2)?

2.25 moles H2

Explanation:

The equation N2+ 3H2 > 2NH3

1 mol of N2 gives 3 mol of H2

Then

. 75 mole N2 give 3*.75 = 2.25 moles of H2

the correct answer is answer a. a mixture

no other options make sense

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"the periodic table is arranged in order of atomic number."