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mart [117]
3 years ago
6

A student boils 9.43 grams of an unknown substance into vapor. If completely vaporizing the substance required 8,720 joules of e

nergy, what is the heat of vaporization?
Chemistry
2 answers:
kondor19780726 [428]3 years ago
6 0

The heat of vaporation is 924.

Mkey [24]3 years ago
3 0

The heat of vaporization is  =924.71  j/g

<em><u>explanation</u></em>

<u><em> </em></u>Heat of  vaporization is amount  of heat require   to vaporize  1  gram  of a substance.

Heat of  vaporization required is therefore=8720  joules/9.43  grams=924.71   j/g

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When a salt is added to a polar solvent like water, the ions interact with the solvent molecules via ____ , which overcome the f
AveGali [126]

Answer:

ion - dipole interactions

Explanation:

Ion - dipole interactions -

It refers to the interaction between the ion and a dipole , ( any species which is capable to get produce slight positive and slight negative charge ) , is known as ion - dipole interactions .

Water is a polar compound , and due to more electronegative oxygen atom , it can have slight negative charge and correspondingly , hydrogen atom can attain slight positive charge , and thereby generates a dipole .

Now , from the question,

The salt when dissolved in water , breaks down to ions , cations and anion , and these ions interacts with the polar water molecules , giving rise to the ion - dipole interactions .

8 0
3 years ago
An air mass usually forms in an area of _____. low pressure because it's stable low pressure because it's unstable high pressure
horsena [70]

Answer: high pressure because it's stable

Explanation:

Air mass is volume of air which has stable temperature, humidity and pressure horizontally. Over time, each air mass acquires properties of the region by residing over same part of a surface.

Areas of low pressure and high pressure occur where there is warm air and cold air respectively. An air mass usually forms over an area of high pressure. Warm air rises up and cold air takes its place. Warm air has low density and low pressure where as cold air has high density and pressure and therefore, sinks to the bottom. This is a stable condition.  The movement of air mass is responsible for maintenance of temperature conditions on Earth.

6 0
3 years ago
if we add mass to a paper airplane then the distance of the plane flies will increase or decrease why?
Ann [662]
It matters to the aerodynamics of it because sometimes it's good to have the weight but only if it can take it.
8 0
3 years ago
A mileage test is conducted for a new car model. Thirty randomly selected cars are driven for a month and the mileage is measure
Leni [432]

Answer:  (27.81,\ 29.39)

Explanation:

Given : Sample size : n= 30 , it means it is a large sample (n≥ 30), so we use z-test .

Significance level : \alpha: 1-0.95=0.05

Critical value: z_{\alpha/2}=1.96

Sample mean : \overline{x}=28.6

Standard deviation : \sigma=2.2

The formula to find the confidence interval is given by :-

\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}

i.e. 28.6\pm (1.96)\dfrac{2.2}{\sqrt{30}}

i.e. 28.6\pm 0.787259889321

\approx28.6\pm 0.79=(28.6-0.79,28.6+0.79)=(27.81,\ 29.39)

Hence, the 95% confidence interval for the mean mpg in the entire population of that car model = (27.81,\ 29.39)

4 0
3 years ago
Living organisms contain carbon compounds.
mash [69]

Answer:

Living organisms do contain carbon compounds. This is true.

Explanation:

7 0
3 years ago
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