CHEMISTRY MIDDLE SCHOOL

A 93-L sample of dry air is cooled from 145 oC to -22 oC at a constant pressure of 2.85 atmospheres). What is the final volume?

Answers

Answer 1

Answer:

Answer:

56 L

Explanation:

We're dealing with a gas in this problem. We may, therefore, apply the ideal gas law for this problem:

$pV = nRT$

We now that we have a constant pressure. Besides, R, the ideal gas law constant, is also a constant number. Let's rearrange the equation so that we have all constant variables on the right and all changing variables on the left:

$(V)/(T) = (nR)/(p) = const$

This means the ratio between volume and temperature is a constant number. For two conditions:

$(V_1)/(T_1) = (V_2)/(T_2)$

Given initial volume of:

$V_1 = 93 L$

Convert the initial temperature into Kelvin:

$T_1 = 145^oC + 273.15 K = 418.15 K$

Convert the final temperature into Kelvin:

$T_2 = -22^oC + 273.15 K = 251.15 K$

Rearrange the equation for the final volume:

$V_2 = V_1 \cdot (T_2)/(T_1) = 93 L\cdot (251.15 K)/(418.15 K) = 56 L$

Related Questions

What kind of particles make up a compound
Which of the following categories of small bodies in the solar system does Ceres belong to? A. Dwarf planets B. Comets C. Meteoroids D. Planets
What is the molecular mass of HCI
What is the mass of 12.3 moles of helium (He)?
Find the molarity of a 450 mL solution containing 13.7 g of ZnSO4.

When temperature increases, what happens to the molecules in a chemical reaction?

Answers

They speed up and the reaction happens faster.

Answer As it heats up, the molecules speed up and the reaction happens faster.

Explanation:

Why is no dew formed on a windy day or when the sky is cloudy?

Answers

Dew forms when the air just above the ground is cooled to its dew point. The air above the ground is cooled because the ground radiates heat into space. If there are clouds overhead the clouds reflect the heat back to the ground so it does not cool and o dew forms. If it is windy then the air just above the ground to the dew point and no dew forms. Thus to form dew you need a still clear keeps on getting mixed with the air higher up and the air does not cooled to the dew point and no dew forms.

Conpare and constrast chemical and physical change give an example of each

Answers

A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

For example, if a piece of paper is cut up into small pieces it still is paper. This would be a physical change in the shape and size of the paper. If the same piece of paper is burned, it is broken up into different substances that are not paper.

When heat is given off in a chemical change or reaction, it is called an exothermic reaction. When heat is absorbed in a chemical change or reaction, it is called an endothermic reaction. The speed at which chemical reactions take place depend on the temperature pressure and how concentrated the substances involved in the chemical reaction are. Sometimes substances called catalysts are used to speed up or help along a chemical reaction. Light is helpful in the processing of film.

Define chemical change and give an example

Answers

Definition-A formation of new chemical substances.
Example- Sugar undergoes a chemical change when it is cooked to make caramel. :3

Hope I helped! Sorry if it's bad.

Chemical changes are the chemical properties associated with a specific matter.

Examples include toxicity, reactivity, stability, flammability, etc.

The equation below shows the incomplete combustion of ethene.C2H4 + O2 → CO2 + H2O

If 2.70 mol C2H4 is reacted with 6.30 mol O2 identify the limiting reagent

Answers

The limiting reagent is O₂.

Firstly, write the balanced chemical equation:

C₂H₄ + O₂ → CO₂ + H₂O

Then, we need to write the mole ratio of the reactants

The theoretical mole ratio is given by the coefficients of the balanced chemical equation: 3 moles of O₂ react with 1 mol of C₂H₄

$\frac{\text{3 mol O_2}}{\text{1 mol C_2H_4}}$ $(3 mol O_2)/(1 mol C_2H_4)$

Now, let's write the mole ratio of the substances available

$(6.3 mol O_2)/(2.70mol C_2H_4)$ ≈ $(2.3 mol O_2)/(1 mol C_2H_4)$

We concluded that,

Since, the ratio of the O₂ to C₂H₄ available is less than the theoretical ratio of O₂ needed to react with C₂H₄, the former is not enough: it will be consumed before the other reagent and it is the limiting reactant.

Hence, the limiting reagent is O₂.

Learn more:

brainly.com/question/18803167

Answer:

The limiting reagent is O₂.

Explanation:

1. Write the balanced molecular equation:

$C_2H_4+3O_2\longrightarrow 2CO_2+2H_2O$

2. Write the mole ratio of the reactants

The theoretical mole ratio is given by the coefficients of the balanced molecula equation: 3 moles of O₂ react with 1 mol of C₂H₄

$(3molO_2)/(1molC_2H_4)$

3. Write the mole ratio of the substances available

$(6.3molO_2)/(2.70molC_2H_4){\approx (2.3molO_2)/(1molC_2H_4)$

4. Conclusion

Since the ratio of the O₂ to C₂H₄ available is less than the theoretical ratio of O₂ needed to react with C₂H₄, the former is not enough: it will be consumed before the other reagent and it is the limiting reactant.

Hence, the limiting reagent is O₂.

What are the Respiration effects on the pH?

Answers

Our blood have a pH around the 7.0, when we hold the breath our cells still breathing, and the release $CO_2$ , this compound react with water (hydrolysis).

$H_2O+CO_2\leftrightharpoons H_2CO_3$

This compound formed by this reaction is acid, carbonic acid.

Them the pH will get lower them normal, and our buld send an action to our body, and this reaction will be the breathing.

Other Questions

Calculate the mass of Cu deposited by the electrolysis of CuCl2 at 4A for 40 minutes.

What are metal strips called that are inside the copper compound solution

A scientist takes a small, partially inflated balloonout of liquid nitrogen (at a very low temperature).As the balloon rests on the table, it begins to growin size. Which statement(s) best explains why theballoon grows?The air from the outside comes inside theballoon. More air means more volume.The air warms and increases particlemovement. Increased particle movementleads to increased volume.sideoIncreased temperature means increasedvolume as long as the container is flexible.

What kind of changes cause iron to rust ?