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3 years ago

How does the density of a 4-g sample of copper compare to that of a 12-g sample of copper?

Chemistry

1 answer:

Sidana [21]3 years ago

8 0

Density as you say Saturn as you say Jupiter as you say big stuff chemistry mike h20 is water

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A mixture of ethyl acetate vapour and air has a relative saturation of 50% at 303 K and a total pressure of 100 kPa. If the vapo

AURORKA [14]

Answer : The correct option is, (b) 0.087

Explanation :

The formula used for relative saturation is:

$\text{Relative saturation}=\frac{P_A}{P_A^o}$

where,

$P_A$ = partial pressure of ethyl acetate

$P_A^o$ = vapor pressure of ethyl acetate

Given:

Relative saturation = 50 % = 0.5

Vapor pressure of ethyl acetate = 16 kPa

Now put all the given values in the above formula, we get:

$0.5=\frac{P_A}{16kPa}$

$P_A=8kPa$

Now we have to calculate the molar saturation.

The formula used for molar saturation is:

$\text{Molar saturation}=\frac{P_{vapor}}{P_{\text{vapor free}}}$

and,

P(vapor free) = Total pressure - Vapor pressure

P(vapor) = $P_A$ = 8 kPa

So,

P(vapor free) = 100 kPa - 8 kPa = 92 kPa

The molar saturation will be:

$\text{Molar saturation}=\frac{P_{vapor}}{P_{\text{vapor free}}}$

$\text{Molar saturation}=\frac{8kPa}{92kPa}=0.087$

Therefore, the molar saturation is 0.087

5 0

3 years ago

Atmospheric pressure at the summit of mount everest is about one third the pressure at sea level, which is 760 mm hg. if oxygen

vichka [17]

Atmospheric pressure at sea level is 760 mmHg.
We have been told that at the summit the pressure is only one third the pressure at sea level.
Then the pressure at the mountain top is $\frac{760}{3}$ mmHg
Air is made of a mixture of gases. the pressure that each gas exerts individually contributes to the total pressure of the system. The pressure that each gas exerts is the partial pressure of that gas which depends on the mole fraction of that gas or percentage composition of the individual gas.
Partial pressure of Oxygen - total pressure x percentage composition
Therefore pO₂ - $\frac{760 * 0.21}{3}$ = 53.2 mmHg
Answer is 53 mmHg

6 0

4 years ago

Read 2 more answers

What are the main feature of chemistry explain in details

nlexa [21]

The main features of chemistry is the periodic table that is the known thing for chemistry but it also has other features

7 0

3 years ago

Read 2 more answers

Listed below are the amounts of mercury (in parts per million, or ppm) found in tuna sushi sampled at different stores. The s

LenaWriter [7]

Answer:

• The 90% inverval estimate of the mean amount of mercury in the population is [0.420 ppm, 1.252 ppm].

Explanation:

1) Data:

• μ = 0.836 ppm

• σ = 0.253 ppm

• z = ?

• 90% confidence interval estimate of the mean = ?

2) Finding Zo for Pr = 90%

The symmetry of the standard normal distribution implies that, for the 90% confidence interval, 5% of the values (area) are above Zo and 5% are below = - Zo.

Using technology (statistic software) or a table of the standard normal probability, you find that for Pr ≥ 0.05 means Zo ≥ 1.6045.

And, by symmetry, Pr ≤ 0.05 means Zo ≤ -1.6045.

3) Calculate the limits of the interval:

• Formula: z = ( X - μ) / σ

• Upper limit: X = zσ + μ = 1.645 (0.253 ppm) + 0.836 ppm = 1.252 ppm.

• Lower limit: X = zσ + μ = -1.645 (0.253ppm) + 0.836 = 0.420 ppm.

Then, the 90% inverval estimate of the mean amount of mercury in the population is [0.420 ppm, 1.252 ppm] ← answer

3 0

4 years ago

How does pressure affect the solubility of gases?

UNO [17]

Greater the pressure,greater the solubility of gas in a liquid.

Want an example?
Here it is, in the cold drinks we buy, CO2(carbon dioxide) is made soluble under high pressure in the liquid. As soon as we open these cans or bottles, the pressure releases.

Isn't it easy?

3 0

3 years ago