A chemist reacted 0.05 moles of solid sodium with water to form sodium hydroxide solution. The chemical reaction for this is: Na+H2O = NaOH +H2 What mass of sodium was reacted?

1 Answer
anor277
Jul 8, 2017

Got a Periodic Table........?

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

Explanation:

Sodium has an atomic mass of #22.99*g*mol^-1#. How do I know this? Well, for a start it is printed on the Periodic Table, a copy of which will be made available in every examination of chemistry and physics you sit........

And so we take the (dimensional) product..........

#22.99*g*cancel(mol^-1)xx0.05*cancel(mol)=??*g#, a bit over one gram...........

Typically, questions like these would also ask you to calculate the volume of dihydrogen gas evolved ......... Can you make this assessment?

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