4) The purity of silicon sample was tested by the redox reaction between NaOH, and silicon in water
according to the below reaction. If 184.9 g of NaOH yielded 6.350 g H2, what is the percent purity
of silicon by mass?
$$Si_{(s)} + NaOH_{(aq)} + H_2O_{(l)} \rightarrow Na_2SiO_3(aq) + H_2(g)$$