Answers: 3
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 13:00, netflixacc0107
Amixture with the same composition throughout is!
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Chemistry, 22.06.2019 19:00, hmontalvo22
How many moles are contained in 5.6 l of h2 at stp
Answers: 3
Chemistry, 22.06.2019 20:30, dinapaul424
Which states of matter have particles that move independently of one another with very little attraction?
Answers: 1
c) If 21.0 g of potassium reacts with 62.5 g of barium nitride, what mass of potassium nitride will...
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