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Calculate the concentration of sodium sulphate (na2s04) in parts per billion (ppb) if 5 g ofna2s04 was dissolved in 10 kg of solution. Na: 22.99, S:32.06, 0:16.00 g/mol (a) 5 x 10 5 ppb (b) (c) (d) 5 x 10 -4ppb 5 x 10 8ppb 5x 10 2ppb

Accepted Answer

The concentration of sodium sulfate (Na2SO4) in parts per billion (ppb) can be calculated as follows:

1. Convert the mass of Na2SO4 to grams:

m = 5 g

2. Convert the mass of the solution to kilograms:

m = 10 kg

3. Calculate the molar mass of Na2SO4:

M = 2(22.99 g/mol) + 32.06 g/mol + 4(16.00 g/mol) = 142.04 g/mol

4. Calculate the number of moles of Na2SO4:

n = m/M = 5 g / 142.04 g/mol = 0.0352 mol

5. Calculate the concentration of Na2SO4 in parts per billion (ppb):

ppb = (n / V) x 10^9
ppb = (0.0352 mol / 10 kg) x 10^9
ppb = 3520 ppb

Therefore, the concentration of sodium sulfate (Na2SO4) in parts per billion (ppb) is 3520 ppb.

The correct answer is: (a) 5 x 10^5 ppb

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