- #1
vijay123
- 122
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heres a question-(tough one)..i jus wunna check my answer..
a small sample of magnesium was placed into a reaction flask as shown. HCL acid was added and the hydrogen gas generated wus bubbled through water into a gas collection tube.when the reaction reached completion, the gas collection tube wus nearly full. then gas was allowed to sit for several minutes. the collection tube wus then adjusted so that the level of water in the tube was equal to the level of water outside the tube. the vol. of gas was determined to be 32ml and the temp. of the water was 22(degress)celsisus. the barometric pressure in the lab. was 750mmhg. the vapour pressure of water at 22(degress)celsisus is 19.4mmhg.
1)calculate the no. of moles of hydrogen gas produced.(my ans. is 0.00127moles).
2)explain why the vapour pressure of water was given.
3)explain why it was necessary to adjeust the level of the tube so that water levels inside and outside of it were the same.
regards
vijay
a small sample of magnesium was placed into a reaction flask as shown. HCL acid was added and the hydrogen gas generated wus bubbled through water into a gas collection tube.when the reaction reached completion, the gas collection tube wus nearly full. then gas was allowed to sit for several minutes. the collection tube wus then adjusted so that the level of water in the tube was equal to the level of water outside the tube. the vol. of gas was determined to be 32ml and the temp. of the water was 22(degress)celsisus. the barometric pressure in the lab. was 750mmhg. the vapour pressure of water at 22(degress)celsisus is 19.4mmhg.
1)calculate the no. of moles of hydrogen gas produced.(my ans. is 0.00127moles).
2)explain why the vapour pressure of water was given.
3)explain why it was necessary to adjeust the level of the tube so that water levels inside and outside of it were the same.
regards
vijay