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10 months ago

10

A 2.000 g sample of CoCl2.xH2O is dried in an oven. When the anhydrous salt is removed from the oven, its mass is 1.565 g. What

is the value of x?

1 answer:

Mashutka [201]10 months ago

6 0

The value of X is 2

The total amount of sample taken is 2.00 g

The amount of sample left in the oven after drying is 1.565g

The amount of sample lost (mass of water driven out) = Total sample-Anhydrous salt left in the oven

= 2.00 - 1.565

= 0.435 grams

The moles of anhydrous salt present in the hydrate = 1.565g/129.83g/mol = 0.01205

The moles of water present in the hydrate = 0.4350g/18.01g/mol = 0.02415

Therefore the ratio of these two are in 1:2 ratio

The complete chemical reaction is CoCl2.2H20

To know more about the Similar calculation and explanation click here:

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Using Raoult's Law

$\frac{P_s}{Pi}= x_i$

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$x_2 = \frac{n_2}{n_i+n_2}$ ------ equation (2)

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