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3 years ago

Whitch statemeant correctly describes a physical change.

Chemistry

2 answers:

lukranit [14]3 years ago

4 0

Answer:
The answer is B

Yuliya22 [10]3 years ago

3 0

The answer is B ( and all your gonna do now is freak the freak out)

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A gas is contained in a cylinder with a volume of 2.9 L at a temperature of 32.7oC and a pressure of 645.3 torr. The gas is then

stealth61 [152]

Answer: 41 atm

Explanation:

Given that:

Original Volume of gas V1 = 2.9L

Temperature T1 = 32.7°C

Convert Celsius to Kelvin

(32.7°C + 273 = 305.7K)

Pressure P1 = 645.3 torr

New Volume V2 = 0.23 L

New temperature T2 = 894.7°C

Convert Celsius to Kelvin

(894.7°C + 273 = 1167.7K)

New pressure = ?

Then, apply the combined gas equation

(P1V1)/T1 = (P2V2)/T2

(645.3 torr x 2.9L)/305.7K = (P2 x 0.23L)/1167.7K

1871.37 / 305.7 = 0.23P2 / 1167.7

To get P2, Cross multiply

1871.37 x 1167.7 = 305.7 x 0.23P2

2185198.749 = 70.311P2

Divide both sides by 70.311

2185198.749/70.311 = 70.311P2/70.311

31079.045 torr = P2

Now, convert pressure in torr to atmosphere

Since 760 torr = 1 atm

31079.045 torr = Z

cross multiply

760 torr x Z = 31079.045 torr x 1 atm

Z = 31079.045 torr / 760 torr

Z = 40.89 atm (Round to the nearest whole number as 41 atm)

Thus, new pressure of gas is 41 atm

3 0

3 years ago

A very small electronegativity difference leads to a:

noname [10]

Non polar covalent bond

6 0

2 years ago

In which medium does sound travel the slowest?

ZanzabumX [31]

Sound actually travels slower in air.This is because sound is kinetic energy and has to pass from molecule to molecule.In gas the molecules are farther apart taking more time for it to pass,in water the molecules are closer so it takes less time for the sound to get from one molecule to another and with cast iron (since it's very dense) the molecules are very close allowing sound to travel quickly with ease.

5 0

3 years ago

Read 2 more answers

Aspirin (C9H8O4) may be synthesized by mixing salicylic acid (C7H6O3) with excess acetic anhydride (C4H6O3).

diamong [38]

Answer:

65.18% is the percent yield for this reaction.

Explanation:

$C_7H_6O_3 + C_4H_6O_3\rightarrow C_9H_8O_4 + C_2H_4O_2$

Moles of salicyclic acid = $\frac{2.0 g}{138 g/mol}=0.01449 mol$

According to reaction 1 mole of salicyclic acid gives 1 mole of aspirin .

Then 0.01449 mole of salicylic acid will give :

$\frac{1}{1}\times 0.01449 mol=0.01449 mol$ of asprin

Mass of 0.01449 moles of aspirin :

= 0.01449 mol × 180 g/mol = 2.6082 g

Theoretical yield of aspirin = 2.6082 g

Experimental yield of aspirin = 1.7 g

The percent yield for this reaction:

$\%(Yield)=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100$

$=\frac{1.7 g}{2.6082 g}\times 100=65.18\%$

65.18% is the percent yield for this reaction.

5 0

3 years ago

What is the total number of moles of the reactants in the following reaction?

exis [7]

Assuming that 2H2O(l) is the product, the reactants would be 2H2(g) and O2(g). The number of moles in the reactants would be 2 moles of H2 and 1 mole of O2.

3 0

3 years ago

Read 2 more answers