# Chemistry (Cliffs AP) by Gary S. Thorpe

By Gary S. Thorpe

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Extra resources for Chemistry (Cliffs AP)

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What is the formula of a compound formed by combining 50. ) and 32 grams of oxygen gas? A. XO2 B. XO4 C. X4O D. X2O E. 50 mole of element X (50. g/100. 50 mole). 0 moles of oxygen atoms. 0 molar ratio is the same as a 1:4 molar ratio, so the answer is XO4. 30 Gravimetrics 9. 8% X by mass. Which of the following would you use to determine the atomic mass of X? 8 B. 8 C. 8 D. 2 m c 2 m A. E. 2% oxygen by weight. 0 moles of O atoms). 0) × 2/7 mole of X. 0 m c 7 m Finding the solution is unnecessary for selecting an answer; however, here is the solution for your information.

A. After the student weighed the hydrate, a piece of rust fell from the tongs into the crucible. B. Moisture driven from the hydrate condensed on the inside of the crucible cover before the student weighed the anhydride. C. All the weighings were made on a balance that was high by 10%. D. The original sample contained some anhydrous copper(II) sulfate. E. The original sample was wet. Answer: E 30% H2O in the hydrate sample represents mass of hydrate - mass of anhydride # 100% mass of hydrate In a problem like this, I like to make up some easy fictitious numbers that I can use to fit the scenarios and see how the various changes affect the final outcome.

02 C. 02 D. 100 E. 14 g C H # 1 mole C H # 1 mole H O = g H 2 O 1 4 10 4 10 2 33 Part II: Specific Topics 12. Element Q occurs in compounds X, Y, and Z. 00 Element Q is most likely: A. N B. O C. F D. Ir E. 00 (fluorine). Use the law of multiple proportions. 13. Which one of the following represents an intensive property? A. temperature B. mass C. volume D. length E. heat capacity Answer: A The measured value of an intensive property does NOT depend on how much matter is being considered. The formula for heat capacity C is C = m ⋅ Cp, where m = mass and Cp = specific heat.