How many moles of hydrogen gas will form if 0.35 moles of Na reacts with an excess of water?​

The equation is this 2H20 +2Na->> 2NaOH + H2

to find moles of product given moles of reactant you need to use the coefficients from the equation.

X mol Na * (1H2/2Na) = Y mol H2

a chemical reaction

explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.