An iron meteorite was analysed for its isotopic argon content. The amount of \( \mathrm{Ar}^{36}...

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An iron meteorite was analysed for its isotopic argon content. The amount of \( \mathrm{Ar}^{36} \) was \( 1.911 \mathrm{~mm}^{3} \) (STP) per kg of meteorite. If each \( \mathrm{Ar}^{36} \) atom had been formed by a single cosmic event, then how many such events must there have been per kg of meteorite? If the answer is \( X \), then the value of \( X / 10^{16} \) is \( (R \) \( \left.=8.4 \mathrm{~J} / \mathrm{K}-\mathrm{mol}, \mathrm{N}_{\mathrm{A}}=6.0 \times 10^{23}\right) \)
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