For the reaction shown, calculate how many moles of NO2 form when each amount of reactant completely reacts. 2N2O5(g)→4NO2(g)+O2(g)

Question

1.4 mol N2O5.

Express your answer using two significant figures.

_________ mol.

Answer 1

Here is a procedure to solve problems of the type.

1 Balance the chemical equation.

2 Determine what you want to find, and what information is given.

3 Determine a conversion factor that you can use to find the value you need. In the present case, you want to find the # of moles of NO2 produced from 1.4 moles of N2O5. The conversion factor is

4 moles NO2 / 2 moles N2O5 (place the compound you wish to find in the numerator of the conversion factor and the compound you are given in the denominator).

4 Multiply the factor by the amount of the given compound.

4 moles NO2 / 2 moles N2O5 x 1.4 moles N2O5 The unit, mole N2O5 cancel leaving the unit mole NO2.

Finally, moles NO2 produced = 2.8 moles.