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Questions (6)
If the passing of three half-lives leaves 33.1 mg of a strontium-90 sample, how much was present in the beginning?
1 answer
428 views
Calculate the atomic mass of titanium. The five titanium isotopes have atomic masses and relative abundances of 45.953 amu
4 answers
2,242 views
A 26.6 g sample of an unknown compound contains 0.8 g of oxygen. What is the percent by mass of oxygen in the compound?
1 answer
502 views
Magnesium combines with oxygen to form magnesium oxide. If 20.07 g of magnesium reacts completely with 6.70 g of oxygen, what is
2 answers
1,463 views
Copper sulfide is formed when copper and sulfur are heated together. In this reaction, 132 g of copper reacts with 53 g of
2 answers
2,381 views
When mercury oxide is heated, it decomposes into mercury and oxygen. If 26.8 g of mercury oxide decomposes, producing 1.8 g
1 answer
1,140 views
