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Science CBSE Homework Assignments
Class 9
Atoms and molecules
Atomic mass
3.
Average atomic mass
Task:
2
m.
1.
The average atomic mass of an element Q is 35.5 u. What are the percentages of isotopes \(_{17}^{35}\textrm{Q}\) and 17/37 Q in the sample?
80%, 20%
70%, 30%
75%, 25%
85%, 25%
2.
Which of the following statements is true?
Mass of 0.5 mole of \(N_2\) gas = Mass of 0.5 mole of N atoms
Mass of 0.5 mole of \(N_2\) gas > Mass of 0.5 mole of N atoms
Mass of 0.5 mole of \(N_2\) gas = Mass f 0.5 mole of \(O_2\) gas
Mass of 0.5 mole of \(N_2\) gas < Mass of 0.5 mole of N atoms
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