Question

An `0.025*mol` quantity of hydrogen gas was collected from the reaction of sodium metal with water. What molar quantity of sodium was used?

Answer 1

`0.05*molxx22.99*g*mol^-1` of sodium metal were reacted.

Explanation:

For the reaction,

`Na(s) + H_2O(l) rarr 1/2H_2(g)uarr + NaOH(aq)`,

we were given a specified molar quantity of reactant.

For the mass we simply mulitply the number of moles by the molar mass, as given in the intro.