Calculate the mass fraction of na2s and na2so3.

| November 16, 2020 | education

To solve the problem, we write down the given: Na2S
Find: w (Na) -? w (S) -?
Decision:
Let’s write down the formula for calculating the mass fractions of sodium and sulfur in the compound.
w = n * Ar / Mr
Let’s calculate the relative molecular weight of the substance.
Mr (Na2S) = 23 * 2 + 32 = 78
Let’s calculate mass fractions
w (Na) = 2 * 23/78 = 0.59 or 59%
w (S) = 32/78 = 0.41 or 41%
To solve the problem, we write down the given: Na2SO3
Find: w (Na) -? w (S) -? w (O) -?
Decision:
Let us write down the formula for calculating the mass fractions of sodium, sulfur and oxygen in the compound.
w = n * Ar / Mr
Let’s calculate the relative molecular weight of the substance.
Mr (Na2SO3) = 23 * 2 + 32 + 16 * 3 = 126
Let’s calculate mass fractions
w (Na) = 2 * 23/126 = 0.37 or 37%
w (S) = 32/126 = 0.25 or 25%
w (O) = 16 * 3/126 = 0.38 or 38%
Answer: w (Na) = 0.59 or 59%, w (S) = 0.41 or 41%; w (Na) = 0.37 or 37%, w (S) = 0.25 or 25%, w (O) = 0.38 or 38%



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