Chemistry 101 Final Exam Ivy Tech questions with answers.

Chemistry 101 Final Exam Ivy Tech |\ |\ |\ |\ |\ |\




questions with answers |\ |\




What is the mass percent of hydrogen in water?
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a: 5.60
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b: 11.2
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c: 33.3
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d: 88.8 - CORRECT ANSWERS ✔✔b
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How many atoms are in 5.80 moles of He?
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a: 3.49 × 10^24
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b: 6.02 × 10^23
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c: 1.03 × 10^23
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d: 4.00 - CORRECT ANSWERS ✔✔a
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What is the value of n when the empirical formula is C3H5
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and the molecular mass is 205.4 g/mol?
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a: 10|\

,b: 0.02
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c: 140
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d: 5 - CORRECT ANSWERS ✔✔d
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How many atoms are in 15.6 grams of silicon?
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a: 0.555
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b: 3.34 × 10^23
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c: 2.64 × 10^26
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d: 438 - CORRECT ANSWERS ✔✔b
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What is the correct value for Avogadro's number?
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a: 6.022 × 10^2.3
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b: 6.022 × 10^33
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c: 6.022 × 10^23
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d: 6.023 × 10^22 - CORRECT ANSWERS ✔✔c
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The empirical formula for C6H6 is C3H3.
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True |\




False - CORRECT ANSWERS ✔✔False
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, Water is 11.2% hydrogen by mass.
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True
False - CORRECT ANSWERS ✔✔True
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One mole of CO2 gas contains 1 mole of carbon atoms
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and 2 moles of oxygen atoms.
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True |\




False - CORRECT ANSWERS ✔✔True
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Avogadro's Number is 6.022 × 1023. |\ |\ |\ |\ |\




True
False - CORRECT ANSWERS ✔✔True
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A 500. gram iron ore sample was determined to contain
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242 grams of iron. What is the mass percent of iron in the
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ore?
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a: 32.6 |\




b: 48.4 |\