Chemistry, 21.11.2019 00:31 igotdiss2178
Identify the process in which the entropy increases. identify the process in which the entropy increases. the phase transition from a solid to a gas a decrease in the number of moles of a gas during a chemical reaction the phase transition from a liquid to a solid the phase transition from a gas to a liquid the phase transition from a gas to a solid
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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, 23.06.2019 00:00
What is the approximate mass of 25 cm3 of silver, if the density is 10.5 g/cm3? a. 0.42 g b. 2.4 g c. 42 g d. 260 g
Answers: 1
Identify the process in which the entropy increases. identify the process in which the entropy incre...
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