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Question 1 of 3
A powder contains 0.5437 moles of Sucrose and 0.7821 moles of Dextrose. What is the mole fraction of Dextrose - to 3 decimal places?
Total Number of Moles of All Components
0.7821 + 0.5437
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Question 2 of 3
450.5 grams of water (RMM 18.02) are associated with 10 grams of Sodium Hydroxide (RMM 40.0). What is the mole fraction of Sodium Hydroxide to 3 decimal places?
Moles of Water = Mass / RMM = 450.5 / 18.02 = 25 moles
Moles of NaOH = Mass / RMM = 10 / 40.0 = 0.25 moles
Total Number of Moles of All Components
0.25 + 25
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Question 3 of 3
150 ml of water (RMM 18.02, density 1g/ml) are associated with 2.925 grams of Sodium Chloride (RMM 58.5). What is the mole fraction of WATER in the system - to 3 decimal places?
Mass of water = 150 x density = 150 x 1 = 150 grams
Moles of Water = Mass / RMM = 150 / 18.02 = 8.32408 moles
Moles of NaCl = Mass / RMM = 2.925 / 58.5 = 0.05 moles
Total Number of Moles of All Components
8.32408 + 0.05
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