3 years ago

The most dangerous form of skin cancer which is often caused by over exposure to ultraviolet radiation is what?

1 answer:

8 0

UV exposure that leads to sunburn is proven in developing melanoma, the most dangerous of the three most common types of skin cancer.

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dedylja [7]

N=m(g)/m.wt
n=85/12(1)+16(2) =1.93 moles

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2 years ago

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A 5.0 L sample of gas is collected at 400. mmHg at 727 C. What is the volume if the temperature were cooled to 77 C and the pres

saul85 [17]

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2 years ago

What total volume of ozone measured at a pressure of 24.5 mmHg and a temperature of 232 K can be destroyed when all of the chlor

ddd [48]

Answer:

$1.75272\ \text{m}^3$

Explanation:

The breakdown reaction of ozone is as follows

$CF_3Cl + UV \rightarrow CF_3 + Cl$

$Cl + O_3 \rightarrow ClO + O_2$

$O_3 + UV \rightarrow O_2 + O$

$ClO + O \rightarrow Cl + O_2$

It can be seen that 2 moles of ozone is required in the complete cycle

So for 10 cycles, 20 moles of ozone is required

m = Mass of $CF_3Cl$ = 15.5 g

M = Molar mass of $CF_3Cl$ = 104.46 g/mol

P = Pressure = 24.5 mmHg

T = Temperature = 232 K

R = Gas constant = $62.363\ \text{L mmHg/K mol}$

Number of moles is given by

$n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{15.5}{104.46}\\\Rightarrow n=0.1484\ \text{moles}$

$20\ \text{moles} = 20\times 0.1484 = 2.968\ \text{moles}$

From ideal gas law we have

$PV=nRT\\\Rightarrow V=\dfrac{nRT}{P}\\\Rightarrow V=\dfrac{2.968\times 62.363\times 232}{24.5}\\\Rightarrow V=1752.72\ \text{L}=1.75272\ \text{m}^3$

For 20 cycles of the reaction the volume of the ozone is $1.75272\ \text{m}^3$ .

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3 years ago

Pls help me on this it’s past due ty

mihalych1998 [28]

Answer:

sorry

Explanation:

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3 years ago

Liquids tend to contract when heated. please select the best answer from the choices provided

pshichka [43]

This statement is false. Everything expands when heated

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2 years ago

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