Answer: 1.57 moles of H3PO4 react with 4.7 moles of K.
Explanation: To calculate the number of moles of H3PO4 that react with 4.7 moles of K, you need to use a mole ratio between H3PO4 and K. The balanced chemical equation for this reaction is:
H3PO4 + 3K → K3PO4 + 3H2
From the balanced equation we can see that for every 1 mole of H3PO4 that reacts, it consumes 3 moles of K. This relationship is known as the mole ratio.
To find out the number of moles of H3PO4 that react with 4.7 moles of K, we can use the following formula:
moles of H3PO4 = (moles of K) / (mole ratio of K to H3PO4)
Substituting in the given values, we get:
moles of H3PO4 = (4.7 moles) / (3 moles/1 mole) = 1.57 moles