Answer:
2.3 x 10-23 g.
Explanation:
The mass of a single atom is the mass number, 14, is the mass in grams of one mole of carbon.
One mole of Nitrogen atom is 6.022 x 1023 atoms (Avogadro's number). This can then used to convert a nitogen atom to grams by the ratio:
mass of 1 atom / 1 atom = mass of a mole of atoms / 6.022 x 10^23 atoms.
mass of 1 atom = mass of a mole of atoms / 6.022 x 1023
mass of 1 N atom = 14 / 6.022 x 10^23 N atoms
mass of 1 N atom = 2.325 x 10^-23 g
The mass of a single Nitrogen atom is 2.325 x 10-23 g.
The equation for the reaction is as follows;
NH₃ + HCl --> NH4Cl
one of the 2 reactants have been added in excess, to find out which reactant is in excess we need to find the number of moles of each reactant
NH₃ moles reacted - 6.01 g / 17 g/mol
= 0.35 mol
HCl moles reacted = 4.91 g / 36.5 g/mol
= 0.13 mol
the stoichiometry of NH₃ : HCl = 1:1
therefore the number of moles reacted should be equal, however NH₃ there are more moles than HCl which means that NH₃ has reacted in excess
the number of NH₃ moles that would have reacted = 0.13 mol
The mass of NH₃ reacted = 0.13 mol * 17 g/mol
= 2.21 g
the excess amount of reactant is = 6.01 g - 2.21 g
= 3.8 g
the answer is 3.8 g
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