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OpenStudy (anonymous):
A student heats 22.055g of Ca. The hot metal reacts with O in the air to make a product that has a mass of 30.855g. What is the mass of O that reacted with the metal?
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OpenStudy (joannablackwelder):
Since mass is conserved, all of the mass added to the calcium must come from the the oxygen that reacted with the calcium.
OpenStudy (jfraser):
conservation of mass: it's the law!
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