determine the number of grams of NH3 produced by the reaction of 3.5g of hydrogen gas.

To determine the number of grams of NH3 produced by the reaction of 3.5g of hydrogen gas, you can follow these steps:

Step 1: Write the balanced equation for the reaction:
N2 + 3H2 ==> 2NH3

Step 2: Convert the grams of H2 gas to moles. To do this, divide the given mass by the molar mass of H2.
mols = grams / molar mass
The molar mass of H2 is 2.016 g/mol.

mols H2 = 3.5 g / 2.016 g/mol
mols H2 = 1.734 mol (round to 3 significant figures)

Step 3: Use the coefficients from the balanced equation to convert moles of H2 to moles of NH3. From the balanced equation, the ratio of H2 to NH3 is 3:2.

mols NH3 = mols H2 * (2 mol NH3 / 3 mol H2)
mols NH3 = 1.734 mol * (2/3)
mols NH3 = 1.156 mol (round to 3 significant figures)

Step 4: Finally, convert moles of NH3 to grams of NH3. To do this, multiply the number of moles by the molar mass of NH3.
The molar mass of NH3 is 17.031 g/mol.

grams NH3 = mols NH3 * molar mass NH3
grams NH3 = 1.156 mol * 17.031 g/mol
grams NH3 ≈ 19.7 g (rounded to 3 significant figures)

Therefore, approximately 19.7 grams of NH3 will be produced by the reaction of 3.5 grams of hydrogen gas.