SOLUTION: The cylinder contains 1224 grams of the compound CaSO^4. What is the weight of the oxygen (O) in the compound? (Ca, 40; S, 32; O, 16)

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Question 625307: The cylinder contains 1224 grams of the compound CaSO^4. What is the weight of the oxygen (O) in the compound? (Ca, 40; S, 32; O, 16)
Answer by KMST(5328) About Me  (Show Source):
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The masses of the atoms in atomic mass units are 40 for calcium (Ca), 32 for sulfur (S), and 16 for oxygen (O).
The formula weight for a formula unit of CaSO%5B4%5D%7D%7D+%28calcium+sulfate%2C+anhydrous%29+is%0D%0A%7B%7B%7B40%2B32%2B4%2A16=136
The ratio of masses of oxygen to CaSO%5B4%5D is
4%2A16+oxygen+%2F136+CaSO%5B4%5D+=64oxygen+%2F136CaSO%5B4%5D=8oxygen+%2F17CaSO%5B4%5D=47%
The ratio applies no matter what unit is used to measure mass, as long as we are using the same unit for both substances.
The amount of oxygen (in grams) in 1224 g CaSO%5B4%5D%7D%7D+is%0D%0A%7B%7B%7B1224%2A%288%2F17%29=576
In the mychemistrytutor website the answer may be written as:
(1224 g CaSO%5B4%5D)(64 g O/136g CaSO%5B4%5D)= 576 g O

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If you are trying to do your chemistry homework, the mychemistrytutor site is more likely to answer, and would answer very quickly.