Chemistry, 18.01.2020 06:31 webbjalia04

In the following balanced equation 2c2h6 + 7o2 --> 4co2 + 6h20 if 7.0 g of c2h6 react with 18g of o2, how many grams of water will be produced?

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Answer from: bee3176

Amount of water produced is 8.6778 grams.

Explanation:

To calculate the amount of water produced, we first need to find the limiting reagent and for it we need to find the number of moles. To calculate the moles, we use the following equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ...(1)

Moles of

Given mass of C_2H_6 = 7 grams

Molar mass of C_2H_6 = 30 g/mol

Putting values in above equation, we get:

$\text{Number of moles}=\frac{7g}{30g/mol}=0.2333moles$

Moles of

Given mass of O_2 = 18 grams

Molar mass of O_2 = 32 g/mol

Putting values in above equation, we get:

$\text{Number of moles}=\frac{18g}{32g/mol}=0.5625moles$

For the given chemical reaction, the equation follows:

$2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O$

By Stoichiometry:

7 moles of oxygen reacts with 2 moles of ethane.

So, 0.0261 moles of lead nitrate are produced by = $\frac{2}{7}\times 0.5625=0.1607moles$ of ethane.

As, the required amount of ethane is less than the given amount. Hence, it is considered as the excess reagent.

Oxygen gas is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

7 moles of oxygen gas produces 6 moles of water.

So, 0.5625 moles of oxygen gas will produce = $\frac{6}{7}\times 0.5625=0.4821moles$ of water.

Now, to calculate the mass of water produced, we use equation 1.

Molar mass of water = 18 g/mol

Moles of water produced = 0.4821 moles

Putting values in the equation, we get:

$0.4821mol=\frac{\text{Mass of water}}{18g/mol}$

Mass of water produced = 8.6778 grams.

Hence, amount of water produced is 8.6778 grams.

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

answer; 4 electrons;

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In the following balanced equation 2c2h6 + 7o2 --> 4co2 + 6h20 if 7.0 g of c2h6 react with 18g o...

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