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2 years ago

To convert m-ethylaniline to m-ethylfluorobenzene, it should be treated with nitrous acid followed by _____________.

Chemistry

1 answer:

bezimeni [28]2 years ago

6 0

Answer:

$NaBF_4$

Explanation:

In this reaction, we must exchange the amino group ( $NH_2$ ) for a fluorine atom ( $F$ ). Also, the first step in this reaction is the addition of nitrous acid.

We must remember that the amino group in the presence of nitrous acid produces a diazonium salt. The $N_2$ group is a very good leaving group and many benzene derivatives can be produced from this intermediate (see figure 1).

If what we want is to bond a fluorine atom we must use $NaBF_4$ to be able to produce m-ethylfluorobenzene (see figure 2).

I hope it helps!

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A length of glass tubing is 0.525 m. How many inches long is the tubing? (2.54 cm = 1 inch)

lara31 [8.8K]

If, (.525m)(100 cm/m)(1/2.54 in/cm) = 20.7 in or C

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2 years ago

Read 2 more answers

If your lungs were filled with air containing this level of lead, how many lead atoms would be in your lungs? (Assume a total lu

kolbaska11 [484]

Answer:

1.505×10^23 atoms of lead

Explanation:

Volume of lead in the lungs = total volume of lungs = 5.60L

1 mole = 22.4L

5.6L of lead = 5.6/22.4 = 0.25 mole

From Avogadro's law

1 mole of lead contains 6.02×10^23 atoms of lead

0.25 mole of lead = 0.25×6.02×10^23 = 1.505×10^23 atoms of lead

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2 years ago

How many moles of sodium bicarbonate is needed to neutralize 0.8 ml of sulphuric acid?

svet-max [94.6K]

Answer:

n NaHCO3 = 9.6 E-3 mol

Explanation:

balanced reaction:

2 NaHCO3(s) + H2SO4(ac) ↔ Na2SO4(ac) + 2 CO2(g) + 2 H2O(l)

assuming a concentration of H2SO4 6M....normally worked in the lab

⇒ n H2SO4 = 8 E-4 L * 6 mol/L = 4.8 E-3 mol H2SO4

according to balanced reaction, we have that for every mol of H2SO4 there are two mol of NaHCO3 ( sodium bicarbonate)

⇒ mol NaHCO3 = 4.8 E-3 mol H2SO4 * ( 2 mol NaHCO3 / mol H2SO4 )

⇒ ,mol NaHCO3 = 9.6 E-3 mol

So 9.6 E-3 mol NaHCO3, are the minimun moles necessary to neutralize the acid.

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2 years ago

Water flowing at the rate of 13.85 kg/s is to be heated from 54.5 to 87.8°C in a heat exchanger by 54 to 430 kg/h of hot gas flo

weeeeeb [17]

Answer:

=> 572.83 K (299.83°C).

=> 95.86 m^2.

Explanation:

Parameters given are; Water flowing= 13.85 kg/s, temperature of water entering = 54.5°C and the temperature of water going out = 87.8°C, gas flow rate 54,430 kg/h(15.11 kg/s). Temperature of gas coming in = 427°C = 700K, specific heat capacity of hot gas and water = 1.005 kJ/ kg.K and 4.187 KJ/kg. K, overall heat transfer coefficient = Uo = 69.1 W/m^2.K.

Hence;

Mass of hot gas × specific heat capacity of hot gas × change in temperature = mass of water × specific heat capacity of water × change in temperature.

15.11 × 1.005(700K - x ) = 13.85 × 4.187(33.3).

If we solve for x, we will get the value of x to be;

x = 572.83 K (2.99.83°C).

x is the temperature of the exit gas that is 572.83 K(299.83°C).

(b). ∆T = 339.2 - 245.33/ln (339.2/245.33).

∆T = 93.87/ln 1.38.

∆T = 291.521K.

Heat transfer rate= 15.11 × 1.005 × 10^3 (700 - 572.83) = 1931146.394.

heat-transfer area = 1931146.394/69.1 × 291.521.

heat-transfer area= 95.86 m^2.

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2 years ago

Unknown element x has four energy levels, five valence electrons, and is a metalloid. what is elements x?

kykrilka [37]

Answer:

Element X is Arsenic (As)

Explanation:

Elements in the periodic table are either metals, non-metals or metalloids.
Metals are elements that react by losing electrons to obtain a stable configuration and form cation.
Non-metals are those elements that react by gaining electrons to form a stable configuration and form anion.
Metalloids are elements in the periodic table that have both metallic and non-metallic properties.
Examples of metalloids include Selenium, Arsenic, Boron, etc.
Arsenic is a metalloid in period 4 (four energy levels) with five valence electrons.

8 0

2 years ago