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Anna11 [10]
2 years ago
15

A compound with the molecular formula C10H10O4 produces a 1H NMR spectrum that exhibits only two signals, both singlets. One sig

nal appears at 3.9 ppm with a relative integration value of 79. The other signal appears at 8.1 ppm with a relative integration value of 52. Draw the structure of this compound.

Chemistry
1 answer:
Kamila [148]2 years ago
8 0

Answer:

The attached figure shows the structure of dimethyl terephthalate.

Explanation:

Dimethyl terephthalate is a compound whose formula is C6H4 (COOCH3) 2. It is a diester produced from terephthalic acid and methanol. It is characterized by being a white solid. Another method for the preparation is from p-xylene and methanol, which is characterized by having an oxidation and an esterification.

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Consider four sealed, rigid containers with the following volumes: 50 mL, 100 mL, 250 mL, and 500 mL. If each of these contains
dsp73
First, we assume that helium behaves as an ideal gas such that the ideal gas law is applicable.
                                     PV = nRT
where P is pressure, V is volume, n is number of moles, R is universal gas constant, and T is temperature. From the equation, if n, R, and T are constant, there is an inverse relationship between P and V. From the given choices, the container with the greatest pressure would be the 50 mL. 
5 0
2 years ago
Which one is balanced or unbalanced force 1. Change object motion 2. Push or pull 3. Have direction 4. Do not change objects mot
Margaret [11]

Answer:

Explanation:

1. Change object motion - unbalanced force

2. Push or pull - Balanced forces do not cause a change in motion. When balanced forces act on an object at rest, the object will not move. If you push against a wall, the wall pushes back with an equal but opposite force. Neither you nor the wall will move. Forces that cause a change in the motion of an object are unbalanced forces. So if object move it is unbalanced.

3. Have direction - unbalanced force

4. Do not change objects motion - balanced force

5. Net force does not =0 - unbalanced force

6.net force =0 - balanced force

3 0
2 years ago
The percent composition by mass of a compound is 76.0% c, 12.8% h, and 11.2% o. the molar mass of this compound is 284.5 g/mol.
Leokris [45]
You have a few steps to solve this one. First, we'll find the molar mass by percentage of each element in the molecule. Then, we'll divide each of those relative masses by the atomic mass of each element. The number of times the mass divides into the relative mass is the number of atoms of that element in the molecule:

C: 284.5 x .76 = 216.22
H: 284.5 x .128= 36.416
O: 284.5 x .112 = 31.864.

Now we divide out each element's atomic mass (from the periodic table). it's okay if they're approximated from the decimal answer.
C: 216.22 ÷ 12.011 ≈ 18
H: 36.416 ÷ 1.008 ≈36
O: 31.864 ÷ 15.999 ≈ 2

Therefore, the molecular formula is C18H36O2. 

The empirical formula would be found by dividing out all factors of those subscript numbers. In our case, all of them can be divided by 2. The empirical formula would be C9H18O




7 0
2 years ago
Student Z completes his/her calibration step for part 3 and finds an average massA to be 95.237 g ± 0.005 g. However, in his/her
Troyanec [42]
It is going to be too low because the mass mistakenly used is lower than the initial.
7 0
2 years ago
Read 2 more answers
If you were to assume a 95% yield for the formation of the phosphonium ion, how many milligrams of benzyl chloride and triphenyl
luda_lava [24]
I am attempting the problem for phosphonium Ion rather than its chloride salt. The chemical equation is shown below along with molar masses in mg.

First of all we will calculate the amounts of reactants required for the synthesis of 220 mg of phophonium ion. Calculations for both reactants is as follow,

For Benzyl chloride,
\frac{353420 mg of Phosphonium is formed by reacting}{220 mg of Phosphonium will be formed by} = \frac{126580 g of benzyl chloride}{X}

Solving for X,
X = \frac{220 mg . 126580 mg}{353420 mg}
X = 78.79 mg

For PPh₃:
\frac{353420 mg of Phosphonium is formed by reacting}{220 mg of Phosphonium will be formed by} = \frac{262290 g of PPh3}{X}

Solving for X,
X = \frac{220 mg . 262290 mg}{353420 mg}
X = 163.27 mg

Now
, Assuming these values as for 95 % conversion, we can calculate 100 % yield as follow,

when   \frac{95 percent}{100 percent} = \frac{220 g}{X}
Solving for X,

X = \frac{220 . 100}{95} = 231.57 mg

Now, calculate reactants mass with respect to 231.57 mg
when  \frac{220 mg phosphonium required}{231.57 mg require} = \frac{78.79 g of benzyl chloride}{X}
Solving for ,

X = \frac{231.57 . 78.79}{220} = 82.93 mg of Benzyl chloride

when  \frac{220 mg phosphonium required}{231.57 mg require} = \frac{163.27 g of PPh3}{X}
Solving for ,

X = \frac{231.57 . 163.27}{220} = 171.85 mg of PPh3

So,
reaction was started with reacting 82.93 mg of Benzyl Chloride and 171.85 mg of Triphenyl Phosphine.
7 0
2 years ago
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