A hydrated form of copper sulfate ( CuSO 4 ⋅ x H 2 O ) is heated to drive off all of the water. If there is initially 7.74 g of hydrated salt and there is 4.95 g of anhydrous CuSO 4 after heating, find the number of water molecules associated with each CuSO 4 formula unit.
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Ответ:
5 water molecules
Explanation:
Decomposition of hydrated copper sulphate is given by:
Molar mass of
= 159.6 g/mol
According to stoichiometry:
(159.6+18x) g of
decomposes to give = 159.6g of ![CuSO_4](/tpl/images/0601/4021/48ff9.png)
Thus 7.74 g of
decomposes to give=
g
But it is given 7.74 g of a sample of hydrated salt was found to contain 4.95 g of anhydrous salt.
Thus we can equate the two equations:
x=5
Thus there are 5 water molecules associated with each
formula unit.
Ответ:
4.24 L
Explanation:We are given;
Initial Volume, V1 is 3.10 LInitial temperature, T1 is 13.80°CBut, K = °C + 273.15
Thus, Initial temperature, T1 is 286.95 KInitial pressure, P1 is 1.30 atm New temperature, T2 is 25°C or 298.15 KNew pressure, P2 is 0.988 atmWe are required to calculate the new volume;
We are going to use the combined gas law;According to the combined gas law;Rearranging the formula;
Therefore;
Therefore, the new volume of the gas sample is 4.24 L