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3 years ago

Calculate the mass of 0.0563 mole of aluminum

Chemistry

1 answer:

Nitella [24]3 years ago

8 0

Answer:

Explanation:

atomic molar mass of 27 grams per mole. Al has 13 protons (hence number 13) and it most common ...

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Two elements with the same number of protons but a different number of 2 points

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Answer: isotopes

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3 years ago

The box shows the element nitrogen as it appears in the periodic table.

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Answer:

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3 years ago

For the first order process: AB The half-life of A is 62.1 seconds. If a sample of A initially has 250.0 g, what mass (in g) of

Molodets [167]

<u>Answer:</u> The mass of sample A after given time is 99.05 g.

<u>Explanation:</u>

All the radioactive reactions follows first order kinetics.

The equation used to calculate half life for first order kinetics:

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

We are given:

$t_{1/2}=62.1s$

Putting values in above equation, we get:

$k=\frac{0.693}{62.1}=0.011s^{-1}$

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $0.011s^{-1}$

t = time taken for decay process = 84.2 s

$[A_o]$ = initial amount of the reactant = 250 g

[A] = amount left after decay process = ?

Putting values in above equation, we get:

$0.011s^{-1}=\frac{2.303}{84.2s}\log\frac{250}{[A]}$

$[A]=99.05g$

Hence, the mass of sample A after given time is 99.05 g.

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3 years ago

Order the units or geologic time from the longest to the shortest era, period, epoch, eon.

sweet [91]

Answer:

The geological time from the longest to the shortest are:

Eon,
Era,
Period and,
Epoch.

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3 years ago