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How many grams of potassium phosphate (K3PO4) will be formed if you react 20.16 grams of potassium hydroxide (KOH) with excess phosphoric acid?

3 KOH + H3PO4 → K3PO4 + 3 H2O

_ grams of K3PO4 (round to 3 sig figs)

a) 234
b) 25.4
c) 64.5
d) 58.7

Respuesta :

I think it’s a or b I tried

25.4g of potassium phosphate (K3PO4) are formed.

What is potassium phosphate?

Potassium phosphate is an inorganic salts of potassium and phosphate.

How to convert mole to grams?

  • Calculate the number of moles mentioned in the question
  • Find the molar mass of the substance.
  • Multiply both the values.

3 KOH + H3PO4 → K3PO4 + 3 H2O

Step 1: Convert from grams to moles using the molar mass.

Step 2: Use the molar ratio to determine moles of other substance.

Step 3: Convert from mole to grams using the molar mass.

Convert grams to moles using the molar mass

25.4g KOH (1 mol KOH/56.098g KOH)

= 0.3593mol KOH

Mass of H3PO4 produced

0.3593 mol KOH ( 1 mol H3PO4/3 mol KOH)

= 0.1197 mol H3PO4

converting mole to grams

0.1197 mol H3PO4 (98g H3PO4/1 mol H3PO4)

= 11.730g H3PO4

Mass of K3PO4 produced

0.3593 mol KOH (1 mol K3PO4/3 mol KOH)

= 0.1197 mol K3PO4

converting mole to grams

0.1197 mol K3PO4 (212.267g K3PO4/1 MOL K3PO4)

= 25.408g K3PO4

Hence, option b is the correct answer.

To learn more about mole to gram conversion here

https://brainly.com/question/20833007

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