Answered

Upon heating a sample of NiCl2•6H2O, a sample originally weighing 3.5 g yields an anhydrous salt residue weighing 2.1g. What is the percent by mass of water in the hydrate?

Answer :

Answer:

Percent by mass = 40%

Explanation:

Mass of Compound before heating = 3.5g

Mass of compound after heating = 2.1g

Mass of water present = 3.5g - 2.1g = 1.4g

Percent by mass = ( Mass of water /  Mass of compound ) x 100

Percentage by mass = (1.4 / 3.5) x 100

Percent by mass = 0.4 x 100

Percent by mass = 40%

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