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2 years ago

What is the difference between heat of formation and heat of reaction? Give examples and units

Chemistry

1 answer:

yanalaym [24]2 years ago

8 0

Answer:

The main difference between the heat of formation and heat of reaction is that heat of formation is the amount of energy either absorbed or released during the formation of a compound whereas heat of reaction is the amount of energy either absorbed or released during any chemical reaction.

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Identify the conjugate base in each pairs

DiKsa [7]

Answer: 1) $RCOO^-$

2) $H_2PO_4^-$

3) $RNH_2$

4) $HCO_3^-$

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.

1) $RCOOH\rightarrow RCOO^-+H^+$

Here, $RCOOH$ is loosing a proton, thus it is considered as an acid and after losing a proton, it forms $RCOO^-$ which is a conjugate base.

2) $H_3PO_4\rightarrow H_2PO_4^-+H^+$

Here, $H_3PO_4$ is loosing a proton, thus it is considered as an acid and after losing a proton, it forms $H_2PO_4^-$ which is a conjugate base.

3) $RNH_3^+\rightarrow RNH_2+H^+$

Here, $RNH_3^+$ is loosing a proton, thus it is considered as an acid and after losing a proton, it forms $RNH_2$ which is a conjugate base.

4) $H_2CO_3\rightarrow HCO_3^-+H^+$

Here, $H_2CO_3$ is loosing a proton, thus it is considered as an acid and after losing a proton, it forms $HCO_3^-$ which is a conjugate base.

8 0

2 years ago

The blue colour of the sky results from the scattering of sunlight by air molecules. Blue light has a frequency if about 7.5*10^

erastovalidia [21]

Answer: The energy of a mole of photon associated with this frequency is $49.5\times 10^{-20}J$

Explanation:

The energy and frequency are related by :

$E=N\times h\times \nu$

E = energy of photon

N = number of moles = 1

h = planks constant = $6.6\times 10^{-34}Js$

$\nu$ = frequency = $7.5\times 10^{14}Hz$

$E=1\times 6.6\times 10^{-34}Js\times 7.5\times 10^{14}s^{-1}=49.5\times 10^{-20}J$

The energy of a mole of photon associated with this frequency is $49.5\times 10^{-20}J$

6 0

2 years ago

select all of the following ways in which legislators can attempt to force negotiation on a bill by slowing down the legislative

earnstyle [38]

Answer:

correct answers:

objecting to a local and consent bill

chubbing

filibuster

incorrect answers:

amending legislation

vetoing legislation

Explanation:

7 0

2 years ago

A mixture of copper and tin would be called _________.

Alexus [3.1K]

It would be called an alloy.

5 0

3 years ago

An atom has 32 protons, 40 neutrons, and 32 electrons. What is the charge of the atom’s nucleus?

eimsori [14]

The charge is neutral.

To find the charge, subtract the number of electrons from the number of protons. Because they are the same, there is no charge.

8 0

3 years ago