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Rudiy27
3 years ago
15

it takes 60 days for 1024 grams of element XY to decay to 32 grams. what is the half life of element XY

Chemistry
1 answer:
KonstantinChe [14]3 years ago
5 0

Answer:

The half life of element XY is 12 days

Explanation:

Given:

Time taken for  1024 grams to decay into 32 grams  = 60 days

To Find:

The half life of element XY = ?

Solution:

The Half life is calculated by

N = N_0 (\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}

t_{\frac{1}{2}} =\frac{t}{log_{\frac{1}{2}}( \frac{N(t)}{N_0})}}

Substituting the values,

t_{\frac{1}{2}} =\frac{60}{log_{\frac{1}{2}}( \frac{32}{1024})}}

t_{\frac{1}{2}} =\frac{60}{log_{\frac{1}{2}}(0.03125)}}

t_{\frac{1}{2}} =\frac{60}{5}

t_{\frac{1}{2}} = 12

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3 years ago
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KATRIN_1 [288]
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I hope I helped :3
7 0
2 years ago
In a mixture of 2 ideal gases, A and B, PA = 0.2PB, what is the mole fraction of A?
Alborosie

Answer:

0.1667

Explanation:

Hello,

Dalton's law defines:

y_i=\frac{P_i}{P_T}

A total pressure is:

P_T=P_A+P_B

So, for A (solving for P_A in the previous equation, we get:

y_A=\frac{P_A}{P_A+P_B}

Since P_A=0.2P_B, we obtain:

y_A=\frac{P_A}{P_A+P_A/0.2}\\y_A=\frac{1}{6}\\y_A=0.1667}

Best regards.

7 0
3 years ago
Volume and moles are __________ related. This relationship can be calculated by using ___________ Law.
Kryger [21]

Answer:

The correct answer is - directly; Avogadro’s.

Explanation:

At the same temperature and pressure, gases of the same or equal volume have the same number of molecules. The relation between the moles of the gases and the volume of the gases are indirectly proportional to one another at the same temperature and pressure. This law is called Avogadro's law. In the case of an ideal gas of a particular mass has the volume and moles are directly proportional.

Thus, the correct answer is - directly; Avogadro’s.

6 0
3 years ago
3Al + 3 NH4ClO4 ---> Al2O3 + AlCl3 + 3 NO + 6H20
Tresset [83]

Answer:

9.63 L of NO

Explanation:

We'll begin by calculating the number of mole in 50.0 g of NH₄ClO₄. This can be obtained as follow:

Mass of NH₄ClO₄ = 50 g

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= 14 + 4 + 35.5 + 64

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Mole of NH₄ClO₄ =?

Mole = mass /molar mass

Mole of NH₄ClO₄ = 50/117.5

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Next, we shall determine the number of mole of NO produced by the reaction of 50 g (i.e 0.43 mole) of NH₄ClO₄. This can be obtained as follow:

3Al + 3NH₄ClO₄ –> Al₂O₃ + AlCl₃ + 3NO + 6H₂O

From the balanced equation above,

3 moles of NH₄ClO₄ reacted to produce 3 moles of NO.

Therefore, 0.43 mole of NH₄ClO₄ will also react to produce 0.43 mole of NO.

Finally, we shall determine the volume occupied by 0.43 mole of NO. This can be obtained as follow:

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Therefore,

0.43 mole of NO = 0.43 × 22.4

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Thus, 9.63 L of NO were obtained from the reaction.

6 0
2 years ago
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