Asked by Anonymous
Consider the following chemical equation.
Na3PO4(aq) + Ca(OH)2(aq) → Ca3(PO4)2(s) + NaOH(aq)
How many grams of calcium hydroxide must react to give 2.81 g of Ca3(PO4)2?
please explain step by step
Na3PO4(aq) + Ca(OH)2(aq) → Ca3(PO4)2(s) + NaOH(aq)
How many grams of calcium hydroxide must react to give 2.81 g of Ca3(PO4)2?
please explain step by step
Answers
Answered by
Dr Russ
You first need to balance the equation.
This will give you the ratio of moles of Ca(OH)2 to Ca3(PO4)2.
calculate the molecular mass of
Ca(OH)2 (=Mp) and Ca3(PO4)2 (=Mo)
from the molecular mass (Mp) of Ca3(PO4)2 calculate the number of moles
number of moles = 2.81/Mp
using the ratio from the equation calculate the number of moles (Mo) of Ca(OH)2 needed to form the 2.81/Mp moles
the mass required is then
Mo x molecular mass of Ca(OH)2
This will give you the ratio of moles of Ca(OH)2 to Ca3(PO4)2.
calculate the molecular mass of
Ca(OH)2 (=Mp) and Ca3(PO4)2 (=Mo)
from the molecular mass (Mp) of Ca3(PO4)2 calculate the number of moles
number of moles = 2.81/Mp
using the ratio from the equation calculate the number of moles (Mo) of Ca(OH)2 needed to form the 2.81/Mp moles
the mass required is then
Mo x molecular mass of Ca(OH)2
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