1). What are the mole fractions of H3PO4 and water in a solution of 12.3 g of H3

Question

1). What are the mole fractions of H3PO4 and water in a solution of 12.3 g of H3PO4 in 138 g of water?

a). mole fraction of H3PO4

b). mole fraction of water

2). The Henry's law constant for CO2 is 3.6102M/atm at 25°C. What pressure (in atm) of carbon dioxide is needed to maintain a CO2 concentration of 0.072 M in a can of lemon-lime soda?

____atm

4). (a) Would you classify sodium sulfate, Na2SO4, as a strong or weak electrolyte?

strong electrolyteweak electrolyte     

(b) A solution is prepared by dissolving 6.20 g Na2SO4 in water to make 200.0 mL of solution. What are the molar concentrations of Na+ ions and SO42 ions in this solution?

[Na+] =  M
[SO42] =  M

Explanation / Answer

mass of H3PO4= 12.3 g
molar mass of H3PO4= 98 g/mol
number of moles of H3PO4 = mass/molarmass
= 12.3/98
=0.1255 mol

mass of H2O = 138 g
molar mass of H2O = 18 g/mol
number of moles of H2O = mass/molarmass
= 138/18
=7.67 mol

a)
mole fraction of H3PO4 = moles of H3PO4/total moles
= 0.1255/(0.1255+7.67)
= 0.016

b)
mole fraction of H2O = 1 - mole fraction of H3PO4
= 1 - 0.016
= 0.984

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