ashleyivers3
20.11.2020 •
Chemistry
If you mass 0.430 g of Co(NO3)2 6H2O and dissolve it in water, what further information would you need to calculate:.
a. the number of moles of Co(NO3)2 in the solution?
b. the molarity of the solution
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Ответ:
a. No information is required.
b. The volume of the solution.
Explanation:
Hello!
In this case, since hydrates are salts which have additional water in their structures, when making mole-mass calculations involving them, we need to consider the how many water molecules we find in the hydrate. In such a way, for 0.430 g of cobalt nitrate hexahydrate (six water molecules), we proceed as follows:
a. Since we have 0.430 g of hydrate, we may compute the moles of anhydrous cobalt nitrate by using the molar mass of the hydrate (291.04 g/mol) and then, by noticing that one mole hydrate has one mole of anhydrous, we are able to compute the moles of anhydrous cobalt nitrate as shown below:
It means no further information is required.
b. Since the molarity is defined by the division of the moles of solute over liters of solution (M=mol/V), we would need the volume of the solution to successfully compute it.
Bes regards!
Ответ: