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2 years ago

When exothermic reactions occur, ______________.

Chemistry

1 answer:

marusya05 [52]2 years ago

3 0

Answer:

heat energy is released into the surrounding

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80.0 liters of oxygen gas is collected over water at 50 degrees celcius. the atomsphereic pressure in the room is 96.00 kPA. wha

Drupady [299]

Partial pressure O2 = total pressure - vapour pressure H2O at 50 deg C
Vapour pressure H2O at 50 deg C = 12.332 kPa
= 96.00 kPa - 12.332 kPa = 83.67 kPa

3 0

3 years ago

Please help me with this chemistry question. Image attached.

Leya [2.2K]

Answer:

Moles of zinc chloride produced are 0.09942 moles.

Explanation:

$Zn+2HCl\rightarrow ZnCl_2+H_2$

Mass of zinc used = 6.5 g

Moles of zinc = $\frac{6.5 g}{65.38 g/mol}=0.09942 mol$

According to reaction, 1 mol of zinc gives 1 mole of zinc chloride,then 0.09942 moles of zinc will give :

$\frac{1}{1}\times 0.09942 =0.09942 mol$ of zinc chloride

Moles of zinc chloride produced are 0.09942 moles.

3 0

3 years ago

At this point Ron is slightly confused, this isn’t surprising. However, Hermione is doing rather well with them. This also isn’t

Zigmanuir [339]

Answer:

$\boxed{\text{0.780 atm}}$

Explanation:

Hermione is pretty smart. She realizes that, according to Dalton's Law of Partial Pressures, each gas exerts its pressure independently of the others, as if the others weren't even there.

She shows Ron how to use the Ideal Gas Law to solve the problem.

pV = nRT

She collects the data:

V = 1.00 L; n = 0.0319 mol; T = 25.0 °C

She reminds him to convert the temperature to kelvins

T = (25.0 +273.15) K = 298.15 K

Then she shows him how to do the calculation.

$p \times \text{1.00 L} = \text{0.0319 mol} \times \text{L}\cdot\text{atm}\cdot\text{0.082 06 K}^{-1}\text{mol}^{-1} \times \text{298.15 K}\\\\1.00p = \text{0.7805 atm}\\\\p = \textbf{0.780 atm}\\\\\text{The partial pressure of the nitrogen is } \boxed{\textbf{0.780 atm}}$

Isn't she smart?

4 0

4 years ago

Please help!!

viva [34]

Answer:

Answer is 2nd

Explanation:

some energy is transformed into mass

5 0

3 years ago

What types of mixture can be separated by chromatography

ser-zykov [4K]

Answer:

mixture is amino acid, peptides, carbohydrates and other simple organic compounds can be separated by paper chromatography.

4 0

3 years ago