<h2>
Question
</h2>
A sample of methane collected when the temp was 30 C and 760mmHg measures 398 mL. What would be the volume of the sample at -5 C and 616 mmHg pressure
<h2>
Answer:</h2>
434.32mL
<h2>
Explanation:</h2>
Using the combined gas law:
= k
Where;
P = Pressure
V = Volume
T = Temperature
k = constant.
It can be deduced that:
= = k ---------------------(i)
Where:
P₁ and P₂ are the initial and final pressures of the given gas
V₁ and V₂ are the initial and final volumes of the given gas
T₁ and T₂ are the initial and final temperatures of the gas.
<em>From the question:</em>
the gas is methane
P₁ = 760mmHg
P₂ = 616mmHg
V₁ = 398mL
V₂ = ?
T₁ = 30°C = (30 +273)K = 303K
T₂ = -5°C = (-5 +273)K = 268K
Substitute these values into equation (i) as follows;
=
Solve for V₂
V₂ =
V₂ = 434.32mL
Therefore, the volume of the sample at -5C and 616mmHg pressure is 434.32mL
Concentration difficulties can be caused by medical, cognitive, or psychological problems or may be related to sleep disorders or medications, Psychological conditions
<h3>What is
Concentration?</h3>
- Concentration means focused attention, and it has many uses and benefits. It assists in studying, enables faster comprehension, improves memory, helps in focusing on a task, job, or goal, and enables you to ignore meaningless and irrelevant thoughts.
- Taking very small breaks by refocusing your attention elsewhere can dramatically improve mental concentration after that. The next time you are working on a project, take a break when you begin to feel stuck. Move around, talk to someone, or even switch to a different type of task.
- Concentration difficulties can be caused by medical, cognitive, or psychological problems or may be related to sleep disorders or medications, Psychological conditions that can interfere with concentration include anxiety, depression, bipolar disorder, emotional trauma, and stress.
To learn more about Concentration, refer to:
brainly.com/question/14469428
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<span>Some
of the solutions exhibit
colligative properties. These properties depend on the amount of solute
dissolved in a solvent. For boiling point elevation, we calculate the increase in temperature by the equation:
</span><span>ΔT(boiling point) =
(Kb)mi
where Kb is a constant, m is the molality of the solution, i is the van't Hoff factor.
From the given data, we can easily calculate for i as follows:
</span>ΔT(boiling point) = (Kb)mi
103.45 - 100 = (0.512)3.90i
i = 1.73 <-------van't Hoff factor
2.63 g
Explanation:
One way to approach this problem is to determine the percent composition of hydrogen in water.
Answer:
Total mass of the reactant = 2+2.5 =4.5 mg
Total mass of product = 4.15 mg
therefore, mass of unreacted oxygen = 4.50-4.15 = 0.35 g