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4 years ago

What is the volume occupied by 0.103 mol of helium gas at a pressure of 0.95 atm and a temperature of 303 K ?

Chemistry

1 answer:

Finger [1]4 years ago

7 0

The pressure of He gas, P = 0.95 atm

Temperature, T = 303 K

Gas constant, R = 0.0821 L.atm.K⁻¹mol⁻¹

Number of moles of He gas, n = 0.103 mol

According to an ideal gas equation, PV = nRT

V = nRT/P

= (0.103 mol) (0.0821 L.atm.K⁻¹mol⁻¹) (303 K) / 0.95 atm

= 2.7 L

Thus, the volume of the He gas is 2.7 L.

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Barium-142 is used as a GI radiocontrast agent. After 1.25 hours, 9.25 μg remains in the patient. Determine the original dose gi

Trava [24]

Answer:

The answer to your question is the original dose of Ba-142 was 1184 μg

Explanation:

Data

Total time = 1.25 hours

The Final amount of Ba = 9.25 μg

The Half-life of Ba = 10.6 minutes

Process

1.- Convert total time to minutes

1 h ----------------- 60 min

1.25 h ------------ x

x = 75 min

2.- Draw a table of this process

Final amount of Ba Time

9.25 75 min

18.5 64.4 min

37 53.8 min

74 43.2 min

148 32.6 min

296 22 min

592 11.4 min

1184 0.8 min

4 0

4 years ago

Rank the following compounds from least acidic(rank 1) to most.A. AcetaldehydeB. Methyl acetate.C. N,N-dimethylacetamide1. least

Phoenix [80]

Answer:

N,N-dimethylacetamide < Methyl acetate < Acetaldehyde

Acetaldehyde - least acidic

Methyl acetate - acidic

N,N-dimethylacetamide - most acidic

Explanation:

The order of acidity of the organic compound under study is primarily influenced by their resonance effect. The resonance effect explains how polar a particular molecule is from the interaction between pi -bonds or a lone electron pair and a pi-bond in a molecule.

In acetaldehyde popularly known as ethanal, the CH₃CHO functional group -CHO is attached to an adjacent end of the compound, which has a lesser resonance effect than methyl acetate.

Methyl acetate, also known as methyl ethanoate, is an ester family with the formula CH₃COOCH₃ is also lesser in its acidity compared to N,N-dimethylacetamide.

Therefore, the order of acidity from the least acidic to the most is:

N,N-dimethylacetamide < Methyl acetate < Acetaldehyde

Acetaldehyde - least acidic

Methyl acetate - acidic

N,N-dimethylacetamide - most acidic

5 0

3 years ago

Question 2 (2 points)

poizon [28]

Answer:

$m_w=439.2g$

Explanation:

Hello!

In this case, since the by-mass percent of a solution is a measure of the mass of the solute over the mass of the solution:

$\%m/m=\frac{m_{solute}}{m_{solution}} *100\%$

As we know the mass of the solution and the by-mass percent, we can compute the mass of glucose in the 480 g of solution:

$m_{solute}=\frac{\%m/m*m_{solution}}{100\%}$

Thus, by plugging in the data, we obtain:

$m_{solute}=\frac{8.5\%*480g}{100\%}=40.8g$

Finally, since the solution is made up of glucose and water, we compute the mass of water as follows:

$m_w=m_{sol}-m_{solute}=480g-40.8g\\\\m_w=439.2g$

Best regards!

7 0

3 years ago

Why reaction between phosphorus and oxygen produces four atoms of phosphorus and five atoms of oxygen

andreev551 [17]

Answer:

Reaction between an oxygen and a phosphorus will produce oxides of phosphorus.

Explanation:

Reaction between oxygen and phosphorus produces four atoms of phosphorus with five atoms of oxygen. Sometimes it produces two atoms of phosphorus and five atoms of oxygen and sometimes four atoms of phosphorus and six atoms of oxygen. It does so depending upon the availability of oxygen. The size of phosphorus atom interferes with the ability to form a double bonds to the other elements, such as nitrogen, oxygen, etc.

4 0

3 years ago

Which type of matter has a definite composition througout and is made of more than on type of element

zvonat [6]

Answer:

Compound

Explanation:

It has a definite composition throughout and can be made of more than one type of element.

4 0

3 years ago