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Question 12 ptsThe molar mass of CuSO4.5H2O is 249.69 g/mol. A student measured out 4.9938g CuSO4.5H2O. How many moles of water molecules are present in the sample?

The molar mass of CuSO4.5H2O is 249.69 g/mol. A student measured out 4.9938g CuSO4.5H2O. How many moles of water molecules are present in the sample?

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Question 22 ptsCaffeine has a molar mass of 194.19 g/mol, and a mass percentage composition of 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen and 16.48% oxygen. What is the molecular formula of caffeine? (Format of the answer should be like: C3H3N3O3)

Caffeine has a molar mass of 194.19 g/mol, and a mass percentage composition of 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen and 16.48% oxygen. What is the molecular formula of caffeine? (Format of the answer should be like: C3H3N3O3)

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Question 41 ptsWhich of the following pH indicate an acidic condition?

Which of the following pH indicate an acidic condition?

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Question 51 ptsIf the color of an aqueous solution is blue, what color does it absorb? (Hint: use the color wheel.)

If the color of an aqueous solution is blue, what color does it absorb? (Hint: use the color wheel.)

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Question 62 ptsSkip to question text.

Iron (III) oxide (159.69 g/mol) can be reduced by carbon monoxide (28.01 g/mol). The skeletal reaction is shown as follow:

Fe2O3(s) + CO(g) --> Fe(l) + CO2(g)

If 15.969g iron (III) oxide reacts with 5.602g carbon monoxide, which reactant is excess? (Hint: balance the equation first.)

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