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3 years ago

Whenever a continuous bell alarm sounds in the Chemistry building:

Chemistry

1 answer:

deff fn [24]3 years ago

4 0

Answer:

Explanation:

This is essentially one of the several safety measures in the chemical laboratory. This particular approach is one used in the case of fire eventualities.

A is wrong

This is because in the advent of a fire incident, it is necessary to evacuate the building as a whole. Meeting in the hallway is still within the building which is not the right thing to do when there’s a fire outbreak. Occupants are expected to leave the building immediately

B. Is also wrong. Taking time to pack your belongings might make you be caught in the inferno. It is expected that you leave the building at once

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NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.084 M in

kolbaska11 [484]

Answer is: pH of solution is 5,17.
Kb(NH₃) = 1,8·10⁻⁵.
c(NH₄Cl) = 0,084 M = 0,084 mol/L.
Chemical reaction: NH₄⁺ + H₂O → NH₃ + H₃O⁺.
Ka · Kb = 10⁻¹⁴.
Ka(NH₄⁺) = 10⁻¹⁴ ÷ 1,8·10⁻⁵.
Ka(NH₄⁺) = 5,55·10⁻¹⁰.
[H₃O⁺] = [NH₃] = x.
Ka(NH₄⁺) = [H₃O⁺] · [NH₃] ÷ [NH₄⁺].
5,55·10⁻¹⁰ = x² ÷ (0,084 M - x).
Solve quadratic equation: x = [H₃O⁺] = 6,8·10⁻⁶ M.
pH = -log[H₃O⁺].
pH = -log(6,8·10⁻⁶ M) = 5,17.

7 0

3 years ago

A mixture of gases is analyzed and found to have the following composition in mol %: CO2 12.0 CO 6.0 CH4 27.3 H2 9.9 N2 44.8 a)

vichka [17]

Answer:

a) CO₂: 21,9%; CO: 7,0%; CH₄: 18,2%; H₂: 0,8%; N₂: 52,1%

b) 24,09 g/mol

Explanation:

a) It is posible to obtain the composition of the gas mixture in weight% using molecular mass of each compound, thus:

12% CO₂× $\frac{44,01g}{1mol}$ = 528,1 g

6% CO× $\frac{28,01g}{1mol}$ = 168,1 g

27,3% CH₄× $\frac{16,05g}{1mol}$ = 438,2 g

9,9% H₂× $\frac{2,02g}{1mol}$ = 20,0 g

44,8% N₂× $\frac{28g}{1mol}$ = 1254,4 g

The total mass of the gas mixture is:

528,1g + 168,1g + 438,2g + 20,0g + 1254,4g = 2408,8 g

Thus composition of the gas mixture in weight% is:

CO₂: $\frac{528,1g}{2408,8g}$ ×100 = 21,9%

CO: $\frac{168,1g}{2408,8g}$ ×100 = 7,0%

CH₄: $\frac{438,2g}{2408,8g}$ ×100 = 18,2%

H₂: $\frac{20,0g}{2408,8g}$ ×100 = 0,8%

N₂: $\frac{1254,4g}{2408,8g}$ ×100 = 52,1%

b) The average molecular weight of the gas mixture is determined with mole % composition, thus:

0,12×44,01g/mol + 0,06×28,01g/mol + 0,273×16,05g/mol + 0,099×2,02g/mol + 0,448×28g/mol = 24,09 g/mol

I hope it helps!

6 0

3 years ago

How can the speed of solvent molecules be slowed down?

Damm [24]

Answer:

Explanation:

When molecules absorb energy they speed up and have a more forceful collision with solute molecules.

3 0

3 years ago

At a certain temperature, the K p Kp for the decomposition of H 2 S H2S is 0.834 . 0.834. H 2 S ( g ) − ⇀ ↽ − H 2 ( g ) + S ( g

stira [4]

Answer:

Total pressure at equilibrium is 0.2798atm.

Explanation:

For the reaction:

H₂S(g) ⇄ H₂(g) + S(g)

Kp is defined as:

$Kp = \frac{P_{H_{2}}*P_S}{P_{H_{2}S}} = 0.834$

If initial pressure of H₂S is 0.150 atm, equilibrium pressures are:

H₂S(g): 0.150atm - x

H₂(g): x

S(g): x

Replacing in Kp:

$\frac{X*X}{0.150atm-X} = 0.834$

X² = 0.1251 - 0.834X

X² + 0.834X - 0.1251 = 0

Solving for X:

X = -0.964 → False solution: There is no negative pressures

X = 0.1298

Thus, pressures are:

H₂S(g): 0.150atm - 0.1298atm = 0.0202atm

H₂(g): 0.1298atm

S(g): 0.1298atm

Thus, total pressure in the container at equilibrium is:

0.0202atm + 0.1298atm + 0.1298atm = 0.2798atm

5 0

3 years ago

Read 2 more answers

Which element has a greater electronegativity: Cr, P, or Ba

KATRIN_1 [288]

Answer:

Explanation:

Information about various chemical compounds and elements. ... P. 2.19. S. 2.58. Cl. 3.16. Ar. n.a.. 4. K. 0.82. Ca. 1.00. Sc. 1.36. Ti. 1.54. V. 1.63. Cr. 1.66. Mn. 1.55. Fe. 1.83. Co. 1.88. Ni. 1.91. Cu. 1.90. Zn. 1.65. Ga. 1.81 ... electronegativity scale, although in the Allred-Rochow scale, helium has the highest electronegativity.

6 0

3 years ago