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3 years ago

The molar mass of a compound is equal to which of the following?

Chemistry

1 answer:

nalin [4]3 years ago

7 0

Answer:

the sum of the atomic masses of the elements

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Calculate the mass of 12.044*10^23atom of carbon

Keith_Richards [23]

Answer: 24 gram is a final Answer.

Explanation:1 mol of carbon weight is 12 gram then

12.044×1023 contain 2 mole carbon so

4 0

3 years ago

In our simulation what did the σ (sigma) stand for?

soldier1979 [14.2K]

Answer:

C -The atomic radius

Explanation:

I took the test :)

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3 years ago

The mating of California condors in zoos is an example of

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Captive breeding,,,,,,,,,,,,,,,,,

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4 years ago

How many moles of Li would react with 4 moles of MgBr₂ in the reaction

ad-work [718]

Answer:

two may be the answer (2)

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2 years ago

A first-order reaction has a half-life of 29.8 s . How long does it take for the concentration of the reactant in the reaction t

lutik1710 [3]

Answer : The time taken for the concentration of the reactant in the reaction to fall to one-fourth of its initial value is, 12.4 seconds.

Explanation :

Half-life = 29.8 s

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

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

$k=\frac{0.693}{29.8s}$

$k=0.0232s^{-1}$

Now we have to calculate the time passed.

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 = $0.0232s^{-1}$

t = time passed by the sample = ?

a = let initial amount of the reactant = x M

a - x = amount left after decay process = $x-\frac{1}{4}\times (x)=\frac{3}{4}\times (X)=\frac{3x}{4}M$

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

$t=\frac{2.303}{0.0232s^{-1}}\log\frac{x}{(\frac{3x}{4})}$

$t=12.4s$

Therefore, the time taken for the concentration of the reactant in the reaction to fall to one-fourth of its initial value is, 12.4 seconds.

7 0

4 years ago