The weight of $1 \ L$ of an unknown gas at $N.T.P.$ is $1.25 \ g$. Which of the following gases can be identified from the given information?
- A$CO_2$
- B$N_2$
- C$NO_2$
- D$O_2$
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Calculate the atomic mass (average) of chlorine using the following data:
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(in $u$)
| Isotope | $\%$ Natural Abundance | Molar Mass $(g/mol)$ |
| $^{35}Cl$ | $75.77$ | $34.9689$ |
| $^{37}Cl$ | $24.23$ | $36.9659$ |
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Calculate the molar mass of the following:
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$(ii)$ $CO_2$
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