CHEMISTRY HIGH SCHOOL

A sample of 0.3257 g of an ionic compound containing the bromide ion (Br−) is dissolved in water and treated with an excess of AgNO3. If the mass of the AgBr precipitate that forms is 0.7165 g, what is the percent by mass of Br in the original compound?

Answers

Answer 1
Answer:

Answer:

Explanation:

Given parameters:

Mass of ionic compound = 0.3257g

Mass of AgBr precipitate = 0.7165g

Unknown:

Percent mass of Br in the original compound.

Solution

The percent mass of Br in original compound = (mass of  Br  in the sample)/(mass of sample)

Now we have to find the mass of Br⁻:

We must note that the same mass of Br⁻ would move through the ionic sample to form the precipitate.

Mass of Br in AgBr = (Atomic mass of Br)/(Molar mass of AgBr)  x mass of precipitate

Mass of Br =  (80)/(80 + 108)  x 0.7165

Mass of Br = 0.426 x 0.7165 = 0.305g

Percent mass of Br = (0.305)/(0.3257) x 100 = 93.7%

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Natural gas, or methane, is an important fuel. Combustion of one mole of methane releases 802.3 kilojoules of energy. How much energy does that represent in kilocalories?

Answers

Answer: 802.3 kilo Joules of energy represents 191.75 kilo Calorie of energy.

Explanation:

Energy released during combustion of one mole methane = 802.3 kilo Joules

If 1 kilo Joule = 0.239006  kilo Calorie

Then ,802.3 kilo joule will be = 802.3*0.239006 kilo Calorie

802.3 kilo joule = 191.75 kilo Calorie

Hence, the energy in kilo Calorie is 191.75 kilo Calorie.

Answer:

191.7497 Kilocalories

Explanation:

Step 1:

Data obtained from the question:

Energy released = 802.3KJ

Step 2:

Conversion of the energy released in kilojoules to kilocalories. This is illustrated below:

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Therefore, 802.3 KJ = 802.3 x 0.239 = 191.7497 Kilocalories

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The state of matter that is able to be compressed is gas

liquid

solid

Answers

Gases are easily compressible

The answer would be gas.

The combustion of 14 grams of co according to the reaction co(g) ½o2(g) co2(g) 67.6 kcal gives off how much heat?

Answers

The balanced reactionthat describes the reaction between carbon monoxide and oxygen to producecarbon dioxide is expressed co(g)+ ½o2(g) → co2(g). The heat of combustion is 67.6 kcal per mole CO. We are given with 14 grams CO. Convert this to mole equal to 0.5 mole. Hence the total heat is 33.8 kcal. 

Answer:

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Explanation:

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Public Domain

Sea arch
Sea cave
Sea cliff
Sea stack

Answers

I saw the picture and it was a SEA STACK.

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Answers

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Answers

They All are Living things.
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