Chemistry, 25.07.2019 02:30, vdestiny858
1. 3.311 * 10^24 particles=? 2. 126 grams of h2o = of moles? whats the answers
Answers: 1
Chemistry, 22.06.2019 07:30, zamirareece17
1. list three scientific reasons cockroaches may fly.
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Chemistry, 22.06.2019 09:20, pandaman632
What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?
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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.)
Answers: 1
Chemistry, 22.06.2019 12:30, Svetakotok
Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?
Answers: 2
1. 3.311 * 10^24 particles=? 2. 126 grams of h2o = of moles? whats the answers...
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