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Problem: Consider the following unbalanced equation:Ca3(PO4)2 (s) + H2SO4 (aq) → CaSO4 (s) + H3PO4 (aq)What masses of calcium sulfate and phosphoric acid can be produced from the reaction of 1.0 kg calcium phosphate with 1.0 kg concentrated sulfuric acid (98% H2SO4 by mass)?

🤓 Based on our data, we think this question is relevant for Professor Mahalingam's class at USP.

FREE Expert Solution

To balance equation → number of atoms must be the same for both sides of reaction → add coefficients


Balanced: Ca3(PO4)2(s) + 3H2SO4(aq) → 3CaSO4(s) + 2H3PO4(aq)

Reactants                        Products

Ca - 3                                     Ca – 3

P - 2                                       P - 2

O - 12 20                                O - 20

H -2 6                                     H - 6

S - 1 3                                    S - 3


mass percent, H2SO4= mass H2SO4  total mass×100mass H2SO4=1.0 kg×103g1 kg×98100


mass H2SO4  980 g H2SO4


Determine limiting reactant  reactant that forms the less amount of product

  • determines the maximum mass of the product (H2O) formed.


Mole to mole comparison: 

  • 3 mol H2SO4 forms 3 mol CaSO4
  • 3 mol H2SO4 forms 2 mol H3PO4
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Problem Details

Consider the following unbalanced equation:

Ca3(PO4)2 (s) + H2SO4 (aq) → CaSO4 (s) + H3PO4 (aq)

What masses of calcium sulfate and phosphoric acid can be produced from the reaction of 1.0 kg calcium phosphate with 1.0 kg concentrated sulfuric acid (98% H2SO4 by mass)?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Limiting Reagent concept. If you need more Limiting Reagent practice, you can also practice Limiting Reagent practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Mahalingam's class at USP.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl 2nd Edition practice problems.