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2 years ago

Which statement below describes a physical property of a substance?

Chemistry

2 answers:

Rama09 [41]2 years ago

8 0

Answer:

Explanation:

levacccp [35]2 years ago

6 0

Answer:

Explanation:

Because density is a physical property and the rest are all chemical properties

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A volume of 129 mL of hydrogen is collected over water. The water level in the collecting vessel is the same as the outside leve

mixas84 [53]

Explanation:

As it is given that water level is same as outside which means that theoretically, P = 756.0 torr.

So, using ideal gas equation we will calculate the number of moles as follows.

PV = nRT

or, n = $\frac{PV}{RT}$

= $\frac{\frac{756}{760}atm \times 0.129 L}{0.0821 Latm/mol K \times 298 K}$

= 0.0052 mol

Also, No. of moles = $\frac{mass}{\text{molar mass}}$

0.0052 mol = $\frac{mass}{2 g/mol}$

mass = 0.0104 g

As some of the water over which the hydrogen gas has been collected is present in the form of water vapor. Therefore, at $25^{o}C$

$P_{\text{water vapor}}$ = 24 mm Hg

= $\frac{24}{760}$ atm

= 0.03158 atm

Now, P = $\frac{756}{760} - 0.03158$

= 0.963 atm

Hence, n = $\frac{0.963 atm \times 0.129 L}{0.0821 L atm/mol K \times 298 K}$

= 0.0056 mol

So, mass of $H_{2}$ = 0.0056 mol × 2

= 0.01013 g (actual yield)

Therefore, calculate the percentage yield as follows.

Percent yield = $\frac{\text{Actual yield}}{\text{Theoretical yield}} \times 100$

= $\frac{0.01013 g}{0.0104 g} \times 100$

= 97.49%

Thus, we can conclude that the percent yield of hydrogen for the given reaction is 97.49%.

3 0

3 years ago

‼️ i really need help. if anyone can do 10 pages of a grade 11 chemistry packet (multiple choice) let me know. i can pay money

Alja [10]

Answer:

mmmmmmmmmmmmmmmmmm

Explanation:

6 0

2 years ago

Which best defines partial pressure in a mixture of gases?

VladimirAG [237]

Answer:

Pressure that is exerted by one gas as if it occupied a container by itself.

7 0

2 years ago

Read 2 more answers

What is the Relative Formula Mass of Potassium bromide?

Aleonysh [2.5K]

The relative formua for Potassium bromide is Kbr

6 0

2 years ago

Describe what happens when ice changes<br> into liquid water.

chubhunter [2.5K]

Answer:

When ice changes into liquid water it melts. The solidified ice in the frozen, would melt via the burning sun shooting its streaks down at the ice. Which causes the ice to melt, and turn into liquid water.

Explanation:

pp poopoo

3 0

3 years ago