Answers: 1
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
Chemistry, 22.06.2019 21:30
If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted
Answers: 3
Chemistry, 23.06.2019 03:30
The molar mass of iron(fe) is 55.8 g/mol. what is the mass in grams of 2.25 moles of iron?
Answers: 1
Given the isotopic symbol below- how many neutrons are present in this
beryllium ion? Answer with j...
Biology, 01.08.2019 00:00
Biology, 01.08.2019 00:00
Biology, 01.08.2019 00:00
Biology, 01.08.2019 00:00
Physics, 01.08.2019 00:00
Mathematics, 01.08.2019 00:00
Geography, 01.08.2019 00:00
Mathematics, 01.08.2019 00:00
Biology, 01.08.2019 00:00