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Chemistry, 22.05.2020 04:01, josephmelichar777
15) What is the luminosity and color of the star Betelgeus?
16) Which star group has an average luminosity of 0.01-0.001 and includes Procyon B?
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Answers: 3
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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.)
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15) What is the luminosity and color of the star Betelgeus?
16) Which star group has an...
16) Which star group has an...
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