What is the molarity of a solution containing 50.00 g of H3PO4 dissolved in 500.0 ml of solution?
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Answer: The molecular weight of NaOH is 40 g/mol.
The number of moles of NaOH
40 g/mol
5 g
=0.125 moles.
500 ml water corresponds to0.500 L.
The molarity of the solution =
0.500 L
0.125 moles
=0.25 M
Explanation: Calculate the number of moles of NaOH present in 750 ml of 0.4 m. solution. (Molecular weight of NaOH is 40):
Q2
8g of NaOH is dissolved in 18g of H
2
O. Mole fraction of NaOH in solution and molality (in mol kg
−1
) of the solutions respectively are:
Q3
Calculate the molarity of a solution containing 5g of NaOH dissolved in the product of a H
2
−O
2
fuel cell operated at 1A current for 595.1 hours.
(Assume 1F=96500 C/mol of electrons and molecular weight of NaOH as 40g mol
−1
)
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