<em>Mass percent composition of K = mass contribution of K/molecular mass of K3Fe(CN)6 x 100% Mass percent composition of K = 117.30 g/mol/329.27 g/mol x 100% Mass percent composition of K = 0.3562 x 100% Mass percent composition of K = 35.62%</em>

6 0

3 years ago

Pickles are made by soaking cucumbers in a mixture of

bulgar [2K]

The chemical reactions necessary are unable to occur without the addition of different ingredients

3 0

3 years ago

You are asked to determine the thermometer correction for your assigned melting point apparatus. You obtain a pure sample of ben

jonny [76]

Answer:

Question 1: -7.3ºC

Question 2: 67.50%

Explanation:

Question 1:

For different reasons a thermometer can not give the exact temperature that it is measuring, such as incorrect calibration. So the thermometer will have an error, and for this, we can have a thermometer correction, doing experiments with a substance that we know the temperature. In this question that substance was benzoic acid.

The thermometer correction (Tc) is the temperature that was measured less the real temperature, so:

Tc = 115.1 - 122.4 = -7.3ºC

It means that the temperature given by the thermometer is 7.3ºC less than the real.

Question 2:

Recrystallization is the process of transforming the liquid in its solid form (crystals). So, the sample of 4.00 grams of benzoic acid, there'll be water or other impurities. The total benzoic acid given was 2.70 grams, so its percentage will be:

(mass of acid/ total mass)x100%

(2.70/4.00)x100% = 67.50%

3 0

3 years ago

What multiplicities are observed for the signals in the off-resonance decoupled 13c nmr spectrum of (2e)-3-chloro acrylaldehyde?

Flauer [41]

The multiplicities that are observed for the signals in the off-resonance decoupled 13c nmr spectrum of (2e)-3-chloro acrylaldehyde is a singlet, a triplet, and a quartet. The correct option is E.

<h3>What is off-resonance decoupling?</h3>

Off-resonance decoupling is a process of removing all hydrogen and carbon coupling from a signal except for the place which is near the nucleus or joined with the nucleus.

In NMR also, the coupling of hydrogen and carbon is removed except for the place near the nucleus.

Thus, the correct option is E) a singlet, a triplet, and a quartet.

To learn more about off-resonance, refer to the link:

brainly.com/question/28169200

#SPJ4

The question is incomplete. Your most probably complete question is given below:

A) 2 singlets and a doublet

B) a singlet and 2 doublets

C) 3 singlets

D) a singlet, a doublet, and a triplet

E) a singlet, a triplet, and a quartet

8 0

2 years ago