3) How much energy does it take to condense 26.5 g of H0 at 100°C? Equation:

Chemistry

1 answer:

andreyandreev [35.5K]3 years ago

8 0

Answer:

59.89 KJ

Explanation:

Data Given:

mass of H₂O (m) = 26.5 g

heat released (Q) = ?

Solution:

This question is related to the latent heat of condensation.

Latent heat of condensation is the amount of heat released when water vapors condenses to liquid.

Formula used

Q = m x Lc . . . . . (1)

where

Lc = specific latent heat of condensation

Latent heat of vaporization of water is exactly equal to heat of condensation with -ve charge

So, Latent heat of vaporization of water has a constant value

Latent heat of vaporization of water = 2260 J/g

Latent heat of condensation of water will be = - 2260 J/g

Put values in eq. 1

Q = (26.5 g) x (- 2260 J/g)

Q = - 59890 J

convert J to kJ

1000 J = 1 KJ

59890 J = 59890 / 1000 = 59.89 KJ

So, 59.89 K of heat will be released. negative sign indicate release of energy for condensation

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What is the iupac name of the following compound? 2,2-dimethyl-4-ethylheptane

Lady bird [3.3K]

Answer:

The IUPAC name of the compound has already been given which is 2,2-dimethyl-4-ethylheptane.

Explanation:

The IUPAC (International Union of Pure and Applied Chemistry) is an authority in chemistry that provides a guideline and standardized methods in the naming of compounds formed from the periodic table.

In order the give an IUPAC name to a compound, certain steps needs to be followed, these includes:

--> Identify the functional group in the compound as this will form the suffix. For example if the functional group is an alkane the suffix will be -ane.

--> Identify the longest carbon chain (it may not be a straight chain) that contains the functional group. This forms the prefix. Example: if the longest carbon chain is 7 carbon atoms then the prefix will be hept-

--> All the carbons of the longest chain should be numbered

--> Identify branched groups on the chain and name them according to the number of carbon atoms. They usually end with -yl.

--> Finally, combine the elements of the name is a single word.

The structural formula of the IUPAC compound can be found in the attached file for a better understanding. The branched groups are circled.