Given the balanced equation: 2Na+S=Na2S What is the total number of moles of S that reacted when 4.0 moles of Na were completely consumed?

1 Answer
Meave60
Jan 20, 2018

#"2.0 mol S"# will react with #"4.0 mol Na"#.

Explanation:

Balanced Equation

#"2Na+S"##rarr##"Na"_2"S"#

We can use the mole ratio between #"Na"# and #"S"# from the balanced equation. Multiply the given moles of #"Na"# by the mole ratio with moles #"S"# in the numerator.

#4.0color(red)cancel(color(black)("mol Na"))xx(1"mol S")/(2color(red)cancel(color(black)("mol Na")))="2.0 mol S"#

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