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2 years ago

HELP PlZ HURRY !!!!!!

Chemistry

1 answer:

kodGreya [7K]2 years ago

6 0

Answer:

$\boxed {\tt d\approx 2.7 \ g/cm^3}$

Explanation:

Density can be found by dividing the mass by the volume.

$d=\frac{m}{v}$

The mass of the marble slab is 4.24 kilograms.

The density is 1564 cubic centimeters.

Since we want to find the density, in g/cm^3, we must convert kilograms to grams. There are 1000 grams in 1 kilogram, so multiply 4.24 by 1000.

1000 g= 1 kg

4.24*1000=4240 grams

Therefore,

$m= 4240 \ g \\v= 1564 \ cm^3$

Substitute the values into the formula.

$d=\frac{4240 \ g}{1564 \ cm^3}$

Divide.

$d= 2.71099744 \ g/cm^3$

Round to the nearest tenth. The 1 in the hundredth place tells us to leave the tenth place as is.

$d \approx 2.7 \ g/cm^3$

The density is about 2.7 grams per cubic centimeter.

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When an unknown amine reacts with an unknown acid chloride, an amide with a molecular mass of 163 g/mol (M = 163 m/z) is formed.

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Answer:

As the molecular mass of given amine is 163 g/mol (a odd number) it means that this compound contains a odd number of Nitrogen atoms. We will first apply Rule of Thirteen to get the molecular formula.

Rule of Thirteen:

First divide the parent peak value by 13 as,

= 163 ÷ 13

= 12.53

Now, multiply 13 by 12,

= 13 × 12 (here, 12 specifies number of carbon atoms)

= 156

Now subtract 156 from 163,

= 163 - 156

= 7

Add 7 into 12,

= 7 + 12

= 19 (hydrogen atoms)

So, the rough formula we have is,

C₁₂H₁₉

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C₁₂H₁₉ -------N--------> C₁₁H₁₇N

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C₁₁H₁₇N -------O--------> C₁₀H₁₃NO

Molecular Formula: C₁₀H₁₃NO

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In NMR the the four peaks around 120 ppm are assigned to a mono substituted benzene ring.

The absence of IR peak above 3200 cm⁻³ also confirms that the amine is tertiary in nature and there is no hydrogen attached to the nitrogen atom.

It can be observed that the peaks in upfield are duplicating. This can be due to the presence of rotamers of said compound.

The most plausible structure for given data is shown below, and the resonance structure along with rotamers are also shown.

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