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wariber [46]
3 years ago
8

Epsom salts is a hydrated ionic compound with the following formula: MgSO4⋅x H2O. A 4.93-g sample of Epsom salts is heated to dr

ive off the water of hydration. The mass of the sample after complete dehydration is 2.41 g. Find the number of waters of hydration (x) in Epsom salts.
Chemistry
1 answer:
Liula [17]3 years ago
7 0

Answer:

number of water molecules are 7

Explanation:

Mass of the hydrated salt = 4.93 g

Mass of the dehydrated salt = 2.41 g

Mass of water lost = 4.93 - 2.41 g = 2.52 g

The moles of the dehydrated salt is :

Amount = 2.41 g

Molar mass of MgSO_4 = 120 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus, moles are:

moles= \frac{2.41\ g}{120\ g/mol}

moles= 0.02\ mol

The moles of water is :

Amount = 2.52 g

Molar mass of H_2O = 18 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus, moles are:

moles= \frac{2.52\ g}{18\ g/mol}

moles= 0.14\ mol

The simplest ration of the two are:

MgSO_4:H_2O = 0.02 : 0.14 = 1 : 7

The formula is MgSO_4.7H_2O

<u>So, number of water molecules are 7 </u>

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