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3 years ago

If 980 Kj of energy are added to 6.2 L of water at 291 K, what will the final temperature of the water be?

Chemistry

1 answer:

jekas [21]3 years ago

4 0

Answer:

T(final) = 328.78 K

Explanation:

Given data:

Energy added = 980 kj

Mass of water = 6.2 L

Initial temperature = 291 K

Final temperature = ?

Solution:

Mass of water = 6.2 L = 6.2 Kg = 6200 g

Specific heat of water = 4.184 j/g.K

Energy added = 980 kj = 980 × 1000 = 980,000 J

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

980,000 J = 6200 g × 4.184 j/g.K × T(final) - 291 K

980,000 J = 25940.8 j/K × T(final) - 291 K

980,000 J / 25940.8 j/K = T(final) - 291 K

T(final) - 291 K = 37.78 K

T(final) = 37.78 K + 291 K

T(final) = 328.78 K

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3 years ago

A mass spectrum of an organic compound shows the relative abundances of M to be 40.58% and M 1 to be 7.022%. Assuming the peaks

sveticcg [70]

Answer:

The number of carbon atoms in the organic compound is 16.

Explanation:

The relative intensity of M + 1 peak (relative to M = 100) in organic compounds can be predicted by the following formula:

[M + 1] = (number of C x 1.07) ---------------------------------------------------- (1)

This formula can also be used to determine the number of carbon from the given intensity. But first, the intensity of [M + 1] relative to [M] = 100 needs to be determined, for which, consider the following calculations,

$[M+1]=(\frac{M+1}{M}) (100)$

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Using equation 1 we get,

$number of C=\frac{[M+1]}{1.07}$

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7 0

4 years ago

madam [21]

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4 years ago

The ____________ is inversely proportional to the wavelength and reported in reciprocal centimeters (cm−1). A technique used for

san4es73 [151]

Answer:Please see below in the explanation column for answers

Explanation:

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3 0

3 years ago

Name the following compound:

krok68 [10]

Answer:

2-hexanone

Explanation:

First, we'll begin by:

1. Locating the longest continuous chain i.e haxane

2. Determine the functional group in the compound. The functional group in ketone (C=O). This changes the name from hexane to hexanone i.e replacing the -e in at the end in hexane with -one to make it hexanone.

3. Give the functional group the lowest low count. In doing this, we'll start counting from the left. The functional group is at carbon 2.

Note: no substitute group is attached.

Now, in naming the compound, we must indicate the position of functional group as illustrated below:

The name of the compound is:

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4 years ago