3 years ago

Help plz!!!!!!!!!!!!!!!

Chemistry

1 answer:

timofeeve [1]3 years ago

8 0

Answer:

Albert Einstein proposed that a beam of light is not a wave propagating through space, but a collection of discrete wave packets—photons.

Explanation:

So the right answer is the first one.

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Balance the equations

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3. 10 Na + 2 NaNO3 = 6 Na2O + N2

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An object was measured by a worker as 35.6 cm long, however, the manufacturer specifications list the length of the object at 35

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A certain water tower hold 4.6×10^5 gallons of water. find the volume of that water in liters.

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Pick the word that best completes the following sentence. A

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2 years ago

ubstance A undergoes a first order reaction A®B with a half-life, t½, of 20 min at 25 °C. If the initial concentration of A in a

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Answer : The concentration of A after 80 min is, 0.100 M

Explanation :

Half-life = 20 min

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

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

$k=\frac{0.693}{20\text{ min}}$

$k=3.465\times 10^{-2}\text{ min}^{-1}$

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 = $3.465\times 10^{-2}\text{ min}^{-1}$

t = time passed by the sample = 80 min

a = initial amount of the reactant = 1.6 M

a - x = amount left after decay process = ?

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

$80=\frac{2.303}{3.465\times 10^{-2}}\log\frac{1.6}{a-x}$

$a-x=0.100M$

Therefore, the concentration of A after 80 min is, 0.100 M

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3 years ago