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Tomtit [17]
3 years ago
8

How many moles are in 35.0 grams of H₂O?

Chemistry
1 answer:
Nikitich [7]3 years ago
3 0
1.94 moles


I did 35/18.02 because 18.02 is the molar mass of water
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A sample of 28 Mg decays initially at a rate of 53500 disintegrations per minute, but the decay rate falls to 10980 disintegrati
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Answer : The half life of 28-Mg in hours is, 6.94

Explanation :

First we have to calculate the rate constant.

Expression for rate law for first order kinetics is given by:

k=\frac{2.303}{t}\log\frac{a}{a-x}

where,

k = rate constant

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a - x = amount left after decay process disintegrate = 53500 - 10980 = 42520

Now put all the given values in above equation, we get

k=\frac{2.303}{48.0}\log\frac{53500}{42520}

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k=\frac{0.693}{t_{1/2}}

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t_{1/2}=6.94hr

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