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Chemistry, 10.07.2019 21:00, kianakilbourn8
Anaturally occurring sample of an element contains only two isotopes. the first isotope has a mass of 68.9255 amu and a natural abundance of 60.11%. the second isotope has a mass of 70.9247 amu. find the atomic mass of the element.
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Chemistry, 22.06.2019 11:40, Wemaybewrong
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
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Chemistry, 23.06.2019 00:30, coralaguilar1702
What is calcium oxide+diphosphorus pentoxide--> calcium phosphate balanced
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Anaturally occurring sample of an element contains only two isotopes. the first isotope has a mass o...
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