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Mademuasel [1]
3 years ago
10

Solve this Stoichiometry problem

Chemistry
1 answer:
vampirchik [111]3 years ago
4 0

Answer : The balanced equation is;


2Al + 3 Br_{2} ----> 2AlBr_{3}.


So now, to calculate how many grams of Br_{2} will be needed to completely convert 15 g of AlBr_{3},


In the reaction 2 moles of Al and 3 moles of Br_{2} will be needed to produce 2 moles of AlBr_{3}.


So, (15.0 g Al) X (1 mole Al / 26.98 g Al) X (3 moles Br_{2} / 2 moles Al) X (159.81 g Br_{2} / 1 mole Br_{2})

= 133 g Br_{2}


Hence, 133g of Br_{2} will be needed to completely convert 15 g of Al into AlBr_{3}.


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A piece of radioactive radium is added to water.
Dafna1 [17]

Ra(s) + H₂O(g) → Ra(OH)₂ (aq) + H₂ (g)

<u>Explanation:</u>

Radioactive radium reacts easily with water produces radium hydroxide and hydrogen gas. In this reaction, Radium is sin solid state reacts with the water in the gaseous state to produces aqueous radium hydroxide and the hydrogen gas. This reaction occurs rapidly than in Barium. We can write this reaction as,

Radium(s) + water(g) → Radium hydroxide (aq) + Hydrogen (gas)

This can be represented using the symbols as,

Ra(s) + H₂O(g) → Ra(OH)₂ (aq) + H₂ (g)

Thus the above process can be expressed with such chemical reaction.

4 0
4 years ago
Is the following sentence true or false?
hammer [34]
The answer is true because what there organs and stuff are made of
8 0
3 years ago
Read 2 more answers
A sample of oxygen gas at a pressure of 0.656 atm and a temperature of 27.2 °C, occupies a volume of 10.7 liters. If the gas is
sladkih [1.3K]

Answer:

The correct answer is 0.536 atm.

Explanation:

The formula to use to solve the given question is,

P1V1 = P2V2

Based on the given information, the initial pressure (P1) of the oxygen gas is 0.656 atm, the initial volume (V1) is 10.7 L. The new volume (V2) given is 13.1 L, there is a need to find the new pressure of the gas (P2).

Now putting the values in the above equation we get,

0.656 atm * 10.7 L = P2 * 13.1 L

P2 = 0.656 atm*10.7 L/13.1 L

P2 = 0.536 atm

3 0
3 years ago
pressure must a sample of nitrogen at 27°C and 0.625 atm be taken so that its pressure becomes 1.125 atm at constant volume?
Elina [12.6K]

Answer:

T2=540K or 267°c

Explanation:

  1. NZ 278°c, 0.625 atm     P1/T1=P2/T2
  2. (27-->273=300K)
  3. T=?,  1.125 atm
  4. 0.625/300=1.125/T2
  5. \frac{0.625}{0.625}≠T2=\frac{1.125×300}{0.625}(divided both sides by 0.625)

Ans: T2=540K or 267°c     How to get 267°c just subtract 540 from 273

3 0
3 years ago
The thallium Subscript 81 Superscript 208 Baseline Tl nucleus is radioactive, with a half-life of 3.053 min. At a given instant,
Genrish500 [490]

Answer: (E) 300 bq

Explanation:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

Radioactive decay process is a type of process in which a less stable nuclei decomposes to a stable nuclei by releasing some radiations or particles like alpha, beta particles or gamma-radiations. The radioactive decay follows first order kinetics.

Half life is represented by t_{\frac{1}{2}

Half life of Thallium-208 = 3.053 min

Thus after 9 minutes , three half lives will be passed, after ist half life, the activity would be reduced to half of original i.e. \frac{2400}{2}=1200, after second  half life, the activity would be reduced to half of 1200 i.e. \frac{1200}{2}=600,  and after third half life, the activity would be reduced to half of 600 i.e. \frac{600}{2}=300,

Thus the activity 9 minutes later is 300 bq.

7 0
3 years ago
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