Percentage of Water in a Hydrate 4) Calculate the percentage of water in the hyd

Question

Percentage of Water in a Hydrate 4) Calculate the percentage of water in the hydrate Name: massor water, × 100% mass of water % water = x 1 mass of hydrate H20 3xt.olamu t 1x1.og amu 8,O 5) Determine the moles of water 1 mole H20 g water Molar Mass H20 ass H2O = moles H2O = moles H20 2.oa 6) Determine the moles of anhydrous salt 1 mole anhyd salt Molar Mass anhyd salt-moles anhydrous salt g anhydrouat g anhydrous salt x 7) Determine the ratio of m Determine the ratio of moles of water to moles of anhydrous salt Divide the moles of water (#5) by the moles of anhydrous salt (#6 Round to the nearest tenth b)

Explanation / Answer

Ans 4.

Mass of water in the hydrated salt ( as calculated in Question 3 ) is 1 g

total mass of hydrated salt = 2.2 g

% water = (1 / 2.2) x 100

= 45.45 %

Ans 5.

number of moles of water = g water x (1 mole of H2O / Molar mass of H2O)

= 1 x 1 / 18.02

= 0.055

Ans 6 .

Moles of anhydrous salt =

g of anhydrous salt x ( 1 mole of anhydrous salt / molar mass of anhydrous salt )

1.2 x ( 1 / 159.609) =

=0.0075 moles

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