Calculate the Molarity

1) 1.04 M

2) 4.02 M

We are given:

Number of Moles (n) = 0.65 moles

Volume of Solution (V) = 1.6 L

Solving for the Molarity:

We know that:

Molarity = nV

(where n is the number of moles and V is the volume of the solution in L)

replacing the variables

Molarity = 0.65 * 1.6

Molarity = 1.04 M

Hence, the Molarity is 1.04 M

We are given:

Volume of Solution = 825 mL OR 0.825 L

Mass of MgS = 28.7 grams

Number of Moles of MgS:

Number of moles = Given mass / Molar mass

Number of Moles = 28.7 / 56.38              [molar mass of MgS = 56.38 g/mol]

Number of Moles = 0.51 moles

Molarity of the Given solution:

We know that:

Molarity = nV  

[where n is the number of moles and V is the volume of the solution in L]

replacing the variables

Molarity = 0.51 * 0.825

Molarity = 0.42 M

Hence, the molarity is 0.42 M

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explanation: