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3 years ago

After chlorofluorocarbons we’re banned, which class of chemicals was used in their place

Chemistry

2 answers:

Damm [24]3 years ago

8 0

Answer:

Hydrofluorocarbons

Explanation:

Law Incorporation [45]3 years ago

3 0

Answer:

Hydrofluorocarbons

Explanation:

Earlier chlorofluorocarbons were used for refrigeration purpose. But they were banned as they were primary cause of ozone depletion.

In order to replace chlorofluorocarbons, now hydrofluorocarbons are used which helps to protect earth from stratospheric ozone-depleting substances.

The difference between chlorofluorocarbons and hydrofluorocarbons is of hydrogen. In hydrofluorocarbons one of the halogen is being replaced by hydrogen.

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A 14.3 g sample of HF is dissolved into 250 mL of solution. The concentration of the solution is *

STALIN [3.7K]

Answer:

The concentration of the solution is 2.86 M

Explanation:

Molarity is a unit of concentration based on the volume of a solution. It is defined as the number of moles of solute that are dissolved in a given volume. In other words, molarity is defined as the number of moles of solute per liter of solution.

The Molarity of a solution is determined by the following expression:

$Molarity (M)=\frac{number of moles of solute}{Volume}$

Molarity is expressed in units ( $\frac{moles}{liter}$ ).

In this case, you must then know the number of moles of HF, for which you must know the molar mass. Being:

H: 1 g/mole
F: 19 g/mole

the molar mass of HF is: HF= 1 g/mole + 19 g/mole= 20 g/mole

Then the following rule of three applies: if 20 g of HF are available in 1 mole, 14.3 g in how many moles will they be?

$moles=\frac{14.3 g*1 mole}{20 g}$

moles= 0.715

So:

number of moles of solute: 0.715 moles
Volume: 250 mL=0.250 L (being 1 L=1000 mL)

Replacing:

$Molarity=\frac{0.715 moles}{0.250 L}$

Solving:

Molarity= 2.86 $\frac{moler}{liter}$ =2.86 M

The concentration of the solution is 2.86 M

6 0

3 years ago

3 ejemplos de sublimacion

Vanyuwa [196]

Uno:

El dióxido de Carson (CO2)

7 0

3 years ago

Whitney's lung capacity was measured as 3.3 l at a body temperature of 37 ∘c and a pressure of 746 mmhg . how many moles of oxyg

myrzilka [38]

the ideal gas equation is PV=nRT
where P=pressure
V=Volume
n=no. of moles
R=universal gas constant
T=temperature
The universal gas constant (R) is 0.0821 L*atm/mol*K
a pressure of 746 mmhg =0.98 atm= 1 atm (approx)
T=37 degrees Celsius =37+273=310 K (convert it to Kelvin by adding 273)
V=0.7 L (only getting oxygen, get 21% of 3.3L)
Solution:
(1 atm)(0.7 L)=n(0.0821 L*atm/mol*K)(310 K)
0.7 L*atm=n(25.451 L*atm/mol)
n=0.0275 mole
Answer:
n=0.0275 mole of oxygen in the lungs.

4 0

3 years ago

Which statement describes particles of an ideal gas, based on the kinetic molecular theory?

Basile [38]

Answer:

The answer is C. Gas particles have no attractive forces between them.

Explanation:

4 0

3 years ago

Read 2 more answers

What element is likely to form an ionic compound with chlorine?

kirill [66]

Sodium (NA)
the sodium atom is donating its 1 valence electron to the chlorine atom. This creates a sodium cation and a chlorine anion. Notice that the net charge of the resulting compound is 0.

5 0

3 years ago