$71 \ g$ of chlorine combines with a metal to form $111 \ g$ of its chloride. The chloride is isomorphous with $MgCl_2 \cdot 6H_2O$. The atomic weight of the metal is:
- A$20$
- B$30$
- C$40$
- D$69$
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Isotope Molar Mass $(g \ mol^{-1})$ Abundance $^{36}Ar$ $35.96755$ $0.337 \%$ $^{38}Ar$ $37.96272$ $0.063 \%$ $^{40}Ar$ $39.9624$ $99.600 \%$
| Isotope | Molar Mass $(g \ mol^{-1})$ | Abundance |
| $^{36}Ar$ | $35.96755$ | $0.337 \%$ |
| $^{38}Ar$ | $37.96272$ | $0.063 \%$ |
| $^{40}Ar$ | $39.9624$ | $99.600 \%$ |
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