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3 years ago

Find the new pressure of 5 L of a gas at STP that is cooled to 250 K and expanded to 6L

Chemistry

1 answer:

UNO [17]3 years ago

5 0

I’m so sorry i have to do this 5L 24

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Laura and 50ml of foil and water to 100 ml of ice water into a freezer what at what temperature will the water freeze

rewona [7]

Don't understand the text, but water always freezes at 0°C as long as its water.

6 0

4 years ago

The reaction A → products is first order. If the initial concentration of A is 0.646 M and, after 72.8 seconds have elapsed, the

mario62 [17]

Answer: 0.00867 moldm-3

Explanation:

Since the reaction is 1st order,

Rate of reaction=∆[A]÷t

0.646-0.0146/72.8= 0.00867

Remember that in a first order reaction, the rate of reaction depends on change in the concentration of only one of the reaction species, A in the problem above.

5 0

3 years ago

The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (s

Mrac [35]

Answer:

Mass of hydrogen gas evolved is 0.0749 grams.

Explanation:

Total pressure of the gases = p = 758 mmHg

Vapor pressure of water = 23.78 mmHg

Pressure of hydrogen gas ,P = p - 23.78 mmHg = 758 mmHg - 23.78 mmHg

P = 734.22 mmHg = $\frac{734.22}{760} atm=0.966 atm$

Temperature of of hydrogen gas ,T= 25°C =298.15 K

Volume of hydrogen gas = V = 0.949 L

Moles of hydrogen gas =n

PV = nRT (Ideal gas equation )

$n=\frac{PV}{RT}=\frac{0.966 atm\times 0.949 L}{0.0821 atm L/mol K\times 298.15 K}$

n = 0.03745 mol

Moles of hydrogen gas = 0.03745 mol

Mass of 0.03745 moles of hydrogen gas = 0.03745 mol × 2 g/mol = 0.0749 g

Mass of hydrogen gas evolved is 0.0749 grams.

3 0

4 years ago

A chemist titrates 0.200 M NaOH, strong base, with 50.00 ML of 0.100 M HCI, strong acid. How many mL of NaOH will be required to

nalin [4]

Answer:

25 mL of NaOH

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

HCl + NaOH —> NaCl + H₂O

From the balanced equation above,

Mole ratio of the acid, HCl (nₐ) = 1

Mole ratio of the base, NaOH (n₆) = 1

Finally, we shall determine the volume of NaOH required for the reaction. This can be obtained as follow:

Molarity of the base, NaOH (M₆) = 0.2 M

Molarity of the acid, HCl (Mₐ) = 0.1 M

Volume of the acid, HCl (Vₐ) = 50 mL

Mole ratio of the acid, HCl (nₐ) = 1

Mole ratio of the base, NaOH (n₆) = 1

Volume of the base, NaOH (V₆) =?

MₐVₐ / M₆V₆ = nₐ / n₆

0.1 × 50 / 0.2 × V₆ = 1

5 / 0.2 × V₆ = 1

Cross multiply

5 = 0.2 × V₆

Divide both side by 0.2

V₆ = 5/0.2

V₆ = 25 mL

Thus, 25 mL of NaOH is needed for the reaction

8 0

3 years ago

1. Which property makes metals good conductors of electricity?

Y_Kistochka [10]

Answer:

I think it will be A

3 0

3 years ago