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Question 1 of 3
How many moles of Ammonia are there in 2.7 litres of 0.3600 M Ammonia solution?
moles
2.7 litres = 2.7 dm3
Moles of Ammonia = 0.3600 x 2.7 moles
Moles of Ammonia = 0.972 moles
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Question 2 of 3
A solution contains 0.4987 M Sodium Acid Phosphate BP. How many millimoles are there in 25 ml of the solution? Answer to 3 significant figures.
Number of Moles = Molarity x Volume of Total System (in dm3 )
Moles of Sodium Acid Phosphate BP = 0.01246 moles
Millimoles of Sodium Acid Phosphate BP = 1000 x 0.01246 mmoles
Millimoles of Sodium Acid Phosphate BP = 12.46 mmoles
Millimoles of Sodium Acid Phosphate BP = 12.5 to 3 sig figs
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Question 3 of 3
How many millimoles of Ascorbic Acid are there in 630 ml of 17.65 mM Ascorbic Acid? Answer to 4 significant figures.
Number of Millimoles = Millimolarity x Volume of Total System (in dm3 )
Millimoles of Ascorbic Acid = 17.65 x 0.63 mmoles
Millimoles of Ascorbic Acid = 11.119 mmoles
Millimoles of Ascorbic Acid = 11.12 mmoles to 4 sig figs
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