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2 years ago

What method of heat transfer occurs when your skin feels hot outside on a sunny, summer day?

Chemistry

2 answers:

Stolb23 [73]2 years ago

4 0

Answer:

i checked it again it's B

Explanation:

radiation sorry

slavikrds [6]2 years ago

3 0

Answer:

B. Radiation

Explanation:

Lol this weekend I got a rlly bad sunburn and ik a lot ab the sun

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Help ASAP pleaseeee thank you

Artyom0805 [142]

The correct answer is B. balance

8 0

2 years ago

The acid-dissociation constant for benzoic acid (C6H5COOH) is 6.3×10−5. Calculate the equilibrium concentration of H3O+ in the s

raketka [301]

Answer : The equilibrium concentration of $H_3O^+$ in the solution is, $2.1\times 10^{-3}M$

Explanation :

The dissociation of acid reaction is:

$C_6H_5COOH+H_2O\rightarrow H_3O^++C_6H_5COO^-$

Initial conc. c 0 0

At eqm. c-x x x

Given:

c = $7.0\times 10^{-2}M$

$K_a=6.3\times 10^{-5}$

The expression of dissociation constant of acid is:

$K_a=\frac{[H_3O^+][C_6H_5COO^-]}{[C_6H_5COOH]}$

$K_a=\frac{(x)\times (x)}{(c-x)}$

Now put all the given values in this expression, we get:

$6.3\times 10^{-5}=\frac{(x)\times (x)}{[(7.0\times 10^{-2})-x]}$

$x=2.1\times 10^{-3}M$

Thus, the equilibrium concentration of $H_3O^+$ in the solution is, $2.1\times 10^{-3}M$

4 0

2 years ago

Are you sure it’s d<br> Plz tell me

Virty [35]

Answer:

? which question

Explanation:

8 0

3 years ago

The number of particles in 8 g 02 molecules are

igor_vitrenko [27]

Answer:

cholesterol

Explanation:

gsdhudbdjbfmcjfjdncbdhdnhdndbchdncbdn f f ff

5 0

2 years ago

Wine goes bad soon after opening because the ethanol ch3ch2oh in it reacts with oxygen gas o2 from the air to form water h2o and

lilavasa [31]

The balanced chemical equation of the reaction described above is,

C2H6O + O2 --> H2O + C2H4O2

If we have 3.84 g of oxygen, we divide by its molar mass.

n = (3.54 g Oxygen gas) x (1 mole O2/ 32 g O2)
n = 0.11 moles O2

Using ratio and proportion,

number of moles of ethanol = (0.11 moles O2) x (1 mole C2H6)
= 0.11 moles C2H6

Then, we multiply the calculated value to its molar mass, 46 grams /mol.
mass of ethanol = (0.11 mol) x (46 grams / mol)
= <em>5.06 grams</em>

8 0

2 years ago