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SVEN [57.7K]
4 years ago
13

Chlorophyll a is one of the green pigments found in plants. Chlorophyll a has the molecular formula C55H72MgN4O5. How many atoms

are in this molecule?
A-136
B-137
C-138
Chemistry
1 answer:
frozen [14]4 years ago
8 0
A-136 because 55+72+4+5=136.
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To distinguish smokers from nonsmokers, an assay for the determination of 2,5-dimethylfuran concentration in whole blood is perf
adelina 88 [10]

Answer:

See explanation

Explanation:

When we have to write an organic molecule, we have to remember the <u>IUPAC rules.</u> In this case, we have: "2,5-dimethylfuran". We can divide the name into two parts:

<u>a) "2,5-dimethyl"</u>

<u>b) "Furan"</u>

For part a) we have the indications of the <u>"subgroups</u>" bonded to the main structure, in this case, we have 2 <u>methyl groups</u> (CH_3) bonded to carbons 2 and 5.

For part b) we have the main, structure. In this case furan, this compound is a <u>cyclic structure</u> of 5 members in which we have in the middle of the molecule an oxygen atom and  2 double bonds (see figure 1).

Finally, when we add the methyl groups to the furan we will get the 2,5-dimethylfuran. (see figure 2).

I hope it helps!

6 0
3 years ago
An aluminum engine block requires 8669 kJ of energy for the temperature to rise from 75.0 °F to 195 °F. The specific heat of lea
quester [9]

Answer:

The answer to your question is 144 kg

Explanation:

Data

Q = 8669 kJ

T1 = 75°F

T2 = 195°F

Cp = 0.897 J/(g°C)

m = ?

Formula

           Q = mCp(T2 - T1)

Process

1.- Convert temperature to °C

T1 = (75 - 32) / 1.8

   = 43/1.8

   = 23.9°C

T2 = (195 - 32) / 1.8

     = 163/1.8

     = 90.6°C

2.- Solve for m

            m = Q / Cp(T2 - T1)

3.- Substitution

            m = 8669000 / 0.897(90.6 - 23.9)

4.- Simplification

            m = 8669000 / 59.83

5.- Result

            m = 144893.66 g or 144.9 kg

6 0
3 years ago
2) Which of the following is a true statement?
Sonbull [250]
Im more than sure that D is the only true answer. Because the root “homo” means the same, so it would only be one type (: lmk if I’m right!
8 0
4 years ago
Which type of chemical reaction occurs in Ca + Cl2 +CaCl2?
NARA [144]

almost positive that its synthesis

4 0
3 years ago
Read 2 more answers
What is meant by a “ chain reaction “ ?
lilavasa [31]

Answer:

a chemical reaction or other process in which the products themselves promote or spread the reaction, which under certain conditions may accelerate dramatically.

Explanation:

the self-sustaining fission reaction spread by neutrons which occurs in nuclear reactors and bombs.

a series of events, each caused by the previous one.

5 0
3 years ago
Read 2 more answers
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