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Home > Chemistry > Limiting Reagent

Using the following reaction, if 5.93 grams of sodium cyanide are reacted with 8.45 grams of sulfuric acid, how many grams of sodium sulfate will be produced? #2NaCN + H_2SO_4 -> Na_2SO_4 + 2HCN#

Answer 1
Naomi AronsonNaomi Aronson

The reaction will produce 8.59 g of #"Na"_2"SO"_4#.

It seems that there is a limiting reactant issue here.

  1. Compose the equation that is balanced.
#"2NaCN" + "H"_2"SO"_4 → "Na"_2"SO"_4 + "2HCN"#
2. Calculate the moles of #"Na"_2"SO"_4# formed from the #"NaCN"#
#"Moles of Na"_2"SO"_4 = 5.93 color(red)(cancel(color(black)("g NaCN"))) × (1 color(red)(cancel(color(black)("mol NaCN"))))/(49.01 color(red)(cancel(color(black)("g NaCN")))) × (1 "mol Na"_2"SO"_4)/(2 color(red)(cancel(color(black)("mol NaCN")))) = "0.060 50 mol Na"_2"SO"_4#
3. Calculate the moles of #"Na"_2"SO"_4# formed from the #"H"_2"SO"_4#
#"Moles of Na"_2"SO"_4 = 8.45 color(red)(cancel(color(black)("g H"_2"SO"_4))) × (1 color(red)(cancel(color(black)("mol H"_2"SO"_4))))/(98.08 color(red)(cancel(color(black)("g H"_2"SO"_4)))) × (1 "mol Na"_2"SO"_4)/(1 color(red)(cancel(color(black)("mol H"_2"SO"_4)))) = "0.086 15 mol Na"_2"SO"_4#
  1. Determine which reactant is limiting.
The limiting reactant is #"NaCN"#, because it produces the fewest moles of product.
5. Calculate the mass of #"Na"_2"SO"_4#
#"Mass of Na"_2"SO"_4 = "0.060 50" color(red)(cancel(color(black)("mol Na"_2"SO"_4))) × ("142.04 g Na"_2"SO"_4)/(1 color(red)(cancel(color(black)("mol Na"_2"SO"_4)))) = "8.59 g Na"_2"SO"_4#
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Answer 2
Avery AdamsAvery Adams

5.93 grams of sodium cyanide reacting with 8.45 grams of sulfuric acid will produce 11.46 grams of sodium sulfate.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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