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2 years ago

100 POINTS!!!

Chemistry

2 answers:

Paul [167]2 years ago

6 0

what do u need help with u pls respond quickly

Pie2 years ago

3 0

Different masses will change its temperature at different rates when exposed to the same amount of thermal energy because the amount of mass affects an object’s ability to absorb thermal energy. Different materials will change the temperature at different rates when exposed to the same amount of thermal energy because each substance has its own specific heat.

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What concentrations of acetic acid (pKa = 4.76) and acetate would be required to prepare a 0.15 M buffer solution at pH 5.0? Not

Leni [432]

Answer:

Acetic acid 0,055M and acetate 0,095M.

Explanation:

It is possible to prepare a 0,15M buffer of acetic acid/acetate at pH 5,0 using Henderson-Hasselblach formula, thus:

pH = pka + log₁₀ [A⁻]/[HA] -Where A⁻ is acetate ion and HA is acetic acid-

Replacing:

5,0 = 4,76 + log₁₀ [A⁻]/[HA]

1,7378 = [A⁻]/[HA] (1)

As concentration of buffer is 0,15M, it is possible to write:

[A⁻] + [HA] = 0,15M (2)

Replacing (1) in (2):

1,7378[HA] + [HA] = 0,15M

2,7378[HA] = 0,15M

[HA] = 0,055M

Thus, [A⁻] = 0,095M

That means you need acetic acid 0,055M and acetate 0,095M to obtain the buffer you need.

i hope it helps!

7 0

3 years ago

The mass of a solid substance is 21.112 g. If the volume of the solid substance is 19.5 cm3, calculate the density of the substa

Ostrovityanka [42]

Answer:

ρ = 1.08 g/cm³

Explanation:

Step 1: Given data

Mass of the substance (m): 21.112 g

Volume of the substance (V): 19.5 cm³

Step 2: Calculate the density of the substance

The density (ρ) of a substance is equal to its mass divided by its volume.

ρ = m / V

ρ = 21.112 g / 19.5 cm³

ρ = 1.08 g/cm³

The density of the substance is 1.08 g/cm³.

6 0

3 years ago

A 32.4 L gas sample at STP is compressed to a volume of 28.4 L, and the temperature is increased to 352 K. What is the new press

Sindrei [870]

Answer:

1.47 atm

Explanation:

Step 1: Given data

Initial volume (V₁): 32.4 L

Initial pressure (P₁): 1 atm (standard pressure)

Initial temperature (T₁): 273 K (standard temperature)

Final volume (V₂): 28.4 L

Final pressure (P₂): ?

Final temperature (T₂): 352 K

Step 2: Calculate the final pressure of the gas

We can calculate the final pressure of the gas using the combined gas law.

P₁ × V₁ / T₁ = P₂ × V₂ / T₂

P₂ = P₁ × V₁ × T₂ / T₁ × V₂

P₂ = 1 atm × 32.4 L × 352 K / 273 K × 28.4 L = 1.47 atm

7 0

3 years ago

I need help due today!!!!!

Hitman42 [59]

Answer:

A. 5 g/mL

Explanation:

5 0

3 years ago

Read 2 more answers

On melting of ice , there is a decrease in volume instead of increase . Why ?

Oliga [24]

Because of the crystal structure of the ice, ice has lower density than liquid water. So the volume of the ice of same mass is greater than water. When melting, the volume will decrease.

8 0

3 years ago