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Novosadov [1.4K]
3 years ago
13

A compound with the empirical formula ch2 has a molar mass of 98 g/mol what is the molecular formula for this compound ?

Chemistry
1 answer:
madam [21]3 years ago
7 0
Approximate molecular masses:
Molecular mass of C = 12
Molecular mass of H = 1

Let n = moles required for CH₂.
Then
nCH₂ = 98
n(12 + 2*1) = 98
14n = 98
n = 7

Answer: The molecular formula is 7CH₂

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Thallium-207 decays exponentially with a half life of 4.5 minutes. if the initial amount of the isotope was 28 grams, how many g
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An exponential decay law has the general form: A = Ao * e ^ (-kt) =>

A/Ao = e^(-kt)

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=> 1/2 = e^(-k*4.5) => ln(2) = 4.5k => k = ln(2) / 4.5 ≈ 0.154

Now replace the value of k, Ao = 28g  and t = 7 min to find how many grams of Thalium-207 will remain:

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