Question

or the following reaction, how many grams of H2O will be produced if you react 2.4 grams of NH3?4 NH3 + 5 O2 → 4 NO + 6 H2OSelect one:a.2.1b.7.5c.1.6d.3.8

Answer 1

3.8grams. Option D is correct

Explanations:

Given the chemical reaction below as shown;

`4NH_3+5O_2\rightarrow4NO+6H_2O`

Given the following parameter

Mass of NH3 = 2.4grams

`\begin{gathered} Mole\text{ of NH}_3=\frac{mass}{molar\text{ mass}} \\ Mole\text{ of NH}_3=(2.4)/(17.031) \\ Mole\text{ of NH}_3=0.1409moles \end{gathered}`

Accoridng to stoichiometry, 4 moles of NH3 produces 6 moles of H2O, therefore the moles of water required will be expressed as:

`\begin{gathered} moles\text{ of }H_2O=(6)/(4)*0.1409 \\ moles\text{ of }H_2O=0.2114moles \end{gathered}`

Calculate the mass of water (H2O)

`\begin{gathered} Mass\text{ of H}_2O=moles* molar\text{ mass} \\ Mass\text{ of H}_2O=0.2114*(2(1)+16) \\ Mass\text{ of H}_2O=0.2114*18 \\ Mass\text{ of H}_2O=3.80grams \end{gathered}`

Therefore the mass in grams of H2O that will be produced if you react 2.4 grams of NH3 is 3.8grams