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Chemistry, 24.12.2019 22:31, vladisking888
Acombustion analysis of a 0.503 g sample of an unknown hydrocarbon yields 1.53 g co 2 2 and 0.756 g h 2 2 o. what is the empirical formula of the sample? give your answer in the form c#h# where the number following the element’s symbol corresponds to the subscript in the formula. (don’t include a 1 subscript explicitly). for example, the formula ch 2 2 o would be entered as ch2o
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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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Acombustion analysis of a 0.503 g sample of an unknown hydrocarbon yields 1.53 g co 2 2 and 0.756 g...
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