Suppose that the student took one more volume
reading of 24.2 mL but forgot to measure the
p...
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How many molecules of sucrose c12h22o11 are there in 454 grams of sucrose
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Chemistry, 22.06.2019 06:00
How many atoms of mg are present in 97.22 grams of mg? 6.022 Ă— 1023 2.408 Ă— 1024 4.818 Ă— 1024 5.855 Ă— 1025
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What are the similarities of physical and chemical change ?
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Chemistry, 22.06.2019 11:40
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.)
Answers: 1
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