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3 years ago

Does anyone no the answer

Chemistry

1 answer:

gulaghasi [49]3 years ago

6 0

In terms of naming organic compounds, always identify the longest parental chain in the molecule first.

For the first it would have 3 carbons

Next number the carbons to give you the substituents the quickest.

For instance for number 1, it does not matter, but for number 2, you would start numbering the carbons from the left compared to the right, because if you number from the left

The methyl group appears immediately after, on 2nd carbon, but if you number from the right, it appears on the 3rd.

Always number to give the lowest position or numbering of the substituents.

1. 2-methylpropane
2. 2,4 - dimethylhexane
3. 2,5 - dimethylheptane

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Answer: 1145.8 years

Explanation:

Half-life of carbon-14 = 5720 years

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{5720\text{years}}$

$k=1.21\times 10^{-4}\text{years}^{-1}$

Now we have to calculate the age of the sample:

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

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

where,

k = rate constant = $1.21\times 10^{-4}\text{years}^{-1}$

t = age of sample = ?

a = let initial amount of the reactant = 100 g

x = amount decayed = 75 g

a - x = amount left after decay process = 100 - 75 = 25g

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

$t==\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{25}$

$t=1145.8years$

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We have the chemical reaction:

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