coopera1744

28.07.2020 • 

Chemistry

Which of these is the best example of Jackson doing science by inquiry? A) Jackson watches a video on objects sinking and floating. He writes down all the main points of the video.

B) Jackson asks himself weather unopened soda cans sink or float. He designs an experiment to find out.

C) Jackson finds calculations on sinking and floating. He copies one of the calculations.

D) Jackson researches the history of soda can use, including how the size of the cans has changed over the last three decades.

Ответ:

21raytyrm

16.08.2021

Chemistry

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ΔH(mix'g)= 42.3Kj/mole

Explanation:

ΔH = (mcΔT)water/moles X

m = mass(g) = 20ml x 1.00g/ml = 20 g

c = 4.184 j/g⁰C

ΔT = 25°C- 15°C = 10°C

moles X = (1.5g)/(76g/mole) = 0.0197 mole X

ΔH = (20g)(4.184j/g°C)(10°C)/(0.0197 mole X) = 42,300J/mole = 42.3Kj/mole (3 sig.figs.)  

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