Answers: 2
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)?
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Chemistry, 23.06.2019 03:30, uniqueray33
The molar mass of nickel(ni) is 58.7 g/mol. how many moles are in an 88 gram sample of nickel?
Answers: 1
Given the following table, which statement is true about atoms A and B...
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