Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
Vin:
Score 0 of 1
Question:
A mass spectrum of magnesium shows three peaks at mass numbers 24, 25 and 26. The relative heights of these peaks are 60, 8 and 10 respectively. What is the mean atomic mass of Mg?
Response:
Wrong
24.1
Should have chosen
24.8
25.4
25.0
elemis:
Are you sure this is the complete question ?
Vin:
I thought the same. http://www.s-cool.co.uk/a-level/chemistry/atoms-molecules-and-stoichiometry/test-it/multiple-choice-questions
^Its a waste of time By the way. Qs are too easy
SkyPilotage:
--- Quote from: Vin on May 31, 2011, 04:14:32 pm ---Score 0 of 1
Question:
A mass spectrum of magnesium shows three peaks at mass numbers 24, 25 and 26. The relative heights of these peaks are 60, 8 and 10 respectively. What is the mean atomic mass of Mg?
Response:
Wrong
24.1
Should have chosen
24.8
25.4
25.0
--- End quote ---
Well it should be done by 24x(60/78)+25x(8/78)+26x(10/78) But the answer is 24.4 :( Info should be enough to solve .... This question is similar to May June 2007 question 1....
Aadeez || Zafar:
--- Quote from: SkyPilotage on May 31, 2011, 08:37:44 pm ---Well it should be done by 24x(60/78)+25x(8/78)+26x(10/78) But the answer is 24.4 :( Info should be enough to solve .... This question is similar to May June 2007 question 1....
--- End quote ---
i got it 24.35 and in the periodic tabel it is 24.3 , i think choosing the closest one would be best
and thus the ans would have been 24.1 as it it is the closest to 24.35, see the examinaer REPORT, somtinh would be mentioned there
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