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1 year ago

(5 pts) Calculating Heat from Thermochemical Equations

Chemistry

1 answer:

Vadim26 [7]1 year ago

8 0

The heat that is released by the combustion of 3.5 moles of methane is 3115 kJ/mol.

<h3>What is a thermochemical equation?</h3>

A thermochemical equation is a reaction equation that incorporates the amount of heat lost/gained.

In this case, the reaction equation is; CH4 + O2 ----->CO2 + 2H2O dH = -890 kJ/mol

If 1 mole of methane releases 890 kJ/mol

3.5 moles of methane will release 3.5 moles * 890 kJ/mol/1 mole

= 3115 kJ/mol

Learn more about combustion reaction:brainly.com/question/12172040?

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<h3>Option D(Last) :- </h3>

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<h3>Explanation:-</h3>

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3 years ago

Read 2 more answers

What is the answer to this because I'm clueless?

SVEN [57.7K]

The answer to what because i dont know

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2 years ago

If you find the mass of a sample to be 42.1 g and the actual mass is 42.0 g. What wold be the percent error

Ksivusya [100]

Answer:

0.24%

Explanation:

The following data were obtained from the question:

Measured value = 42.1 g

Actual value = 42 g

Percentage error =?

Percentage error can be obtained by using the following formula:

Percentage error = |Measured value – Actual value | / Actual value × 100

With the above formula, we can obtain the percentage error as follow:

Measured value = 42.1 g

Actual value = 42 g

Percentage error =?

Percentage error = |42.1 – 42| / 42 × 100

Percentage error = 0.1/42 × 100

Percentage error = 10/42

Percentage error = 0.24%

Therefore, the percentage error is 0.24%

4 0

2 years ago

A single paper clip weighs about one gram. So 10 paper clips would weigh?

GREYUIT [131]

About 10 grams

1 x 10= 10 or 1:1 > 10:10

8 0

3 years ago

What is the Damkohler number? b) What is the significance of a system with a low Damkohler number?

elena-s [515]

Explanation:

(a) A number which is dimensionless and provides us an estimate of the degree of conversion which can be achieved in CSTR, that is, continuous stirred tank reactor is known as Damkohler number.

This number is denoted as Da.

Mathematically, Da = $\frac{\text{reaction rate}}{\text{convection rate}}$

Da = $\frac{-rA \times V}{Fa_{o}}$

Now, for first order system, Da = $\frac{-rA \times V}{Fa_{o}}$

= $\frac{k \times CA_{o} \times V}{v \times CA_{o}}$ = Tk

where, rA = rate of reaction

V = volume of reactor

$Fa_{o}$ = molar flow rate of component A

k = rate constant

$CA_{o}$ = initial concentration of A

v = volumetric flow rate of A

T = residence time

(b) Since, from a given Damkohler number we can figure out the possible conversion of CSTR, that is, continuous stirred tank reactor.

So, if we have a low Damkohler number then the system will give us a less conversion formula. As the conversion is as follows.

X = $\frac{Da}{Da + 1}$

Hence, we can conclude that $Da \leq 0.1$ will give less than 10% conversion as calculated by using above formula.

8 0

3 years ago