Chemistry, 17.12.2019 00:31, raulhill98
An amount of solid barium chloride, 20.8 g, is dissolved in 100 g water in a coffee-cup calorimeter by the reaction: bacl2 (s) ba2+(aq) + 2cl−(aq) the water is originally at 25.0 °c and after the reaction the temperature of the solution is 26.6 °c. (cs = 4.04 j/(g°c) for the solution). what is the enthalpy change (δh) associated with the reaction as written?
Answers: 3
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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
An amount of solid barium chloride, 20.8 g, is dissolved in 100 g water in a coffee-cup calorimeter...
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