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3 years ago

6

The molecular formula for caffeine is C8H10N4O2. Which of the following elements is not found in caffeine? carbon helium nitroge

n oxygen

2 answers:

madreJ [45]3 years ago

8 0

Helium is not found. That is 8 molecules of carbon, 10 Hydrogen, 4 nitrogen, and 2 Oxygen. I think...Hope this helps.

Alina [70]3 years ago

4 0

Answer:

helium

Explanation:

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The rapid increase in volume and release of energy in an extreme manner.

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4 years ago

What is the molarity when 50 grams of NaCl are added to 0.5 L of water

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Answer:

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Explanation:

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3 years ago

The rate constant for a certain reaction is k = 5.40×10−3 s−1 . If the initial reactant concentration was 0.100 M, what will the

IceJOKER [234]

Answer : The concentration after 17.0 minutes will be, $4.05\times 10^{-4}M$

Explanation :

The expression for first order reaction is:

$[C_t]=[C_o]e^{-kt}$

where,

$[C_t]$ = concentration at time 't' (final) = ?

$[C_o]$ = concentration at time '0' (initial) = 0.100 M

k = rate constant = $5.40\times 10^{-3}s^{-1}$

t = time = 17.0 min = 1020 s (1 min = 60 s)

Now put all the given values in the above expression, we get:

$[C_t]=(0.100)\times e^{-(5.40\times 10^{-3})\times (1020)}$

$[C_t]=4.05\times 10^{-4}M$

Thus, the concentration after 17.0 minutes will be, $4.05\times 10^{-4}M$

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3 years ago

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4 years ago

Read 2 more answers