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charle [14.2K]
4 years ago
14

Need to know the process.

Chemistry
1 answer:
erastova [34]4 years ago
7 0
To calculate ΔH of reaction, let's use the following formula

ΔH of reaction= [ΔH of products] - [ΔH of reactants]

note: keep in mind that you have to multiply each value by its coefficient. 

ΔH of reaction= [ ΔH CO2 + ΔH H2O + ΔH Na2CO3] - [ΔH NaHCO3]

ΔH of reaction = [ -393.5 + -241.8 + -1130.9] - [ 2 x -947.7] 

ΔH of reaction= 129.2 kJ
since ΔH is positive, the reaction is endothermic
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Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies.
vazorg [7]

Answer:

Frequency=1.6\times 10^{12}\ Hz

Explanation:

The relation between frequency and wavelength is shown below as:

c=frequency\times Wavelength


c is the speed of light having value 3\times 10^8\ m/s

Given, Wavelength = 188 μm

Also, 1 μm = 10^{-6} nm

So,  

Wavelength = 188\times 10^{-6} m

Thus, Frequency is:

Frequency=\frac{c}{Wavelength}

Frequency=\frac{3\times 10^8}{188\times 10^{-6}}\ Hz

Frequency=1.6\times 10^{12}\ Hz

7 0
4 years ago
How many calories of heat are necessary to raise the temperature of 378.2 g of water from 32.2 oC to the boiling point?
ivolga24 [154]

Answer: multiple apply them together then divide them

Explanation:

8 0
3 years ago
If an element is lustrous, brittle, and a semi-conductor, how would you classify it?
just olya [345]

Metalloid

Explanation:

If an element is lustrous, brittle and a semi-conductor, it is best classified as a metalloid.

Metalloids shares attributes of metals and non-metals.

  • They are often described as semi-metals as they do not share the full properties that makes a metal a metal.
  • Metalloids are lustrous but not malleable like metals.
  • They do not conduct electricity but they do so on certain conditions.
  • Examples are silicon, germanium, boron, arsenic e.t.c
  • They are usually found in the middle of the periodic table.
  • They are not readily alloyed with metals.

Learn more:

Metalloid brainly.com/question/3023499

#learnwithBrainly

7 0
4 years ago
Alchemy is a branch of ancient knowledge that states that the only three essential substances in nature are salt, sulfur, and me
Ivanshal [37]

Answer:

It is pseudoscience because there are at least 118 known elements in nature.

Explanation:

Alchemy is an ancient branch of natural philosophy (not used much anymore).

I also just took the test and it's correct.

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