3 years ago

Radiation that changes direction as it passes through material is called what

Chemistry

1 answer:

RSB [31]3 years ago

7 0

Light? Look up the Third law.
Heat?
Gosh this has been awhile. Please recheck this.

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A sample of ethanol (C2H6O) has a mass of 0.2301 g. Complete combustion of this sample causes the temperature of a bomb calorime

Keith_Richards [23]

Answer: $4.994\times 10^{-3}$ moles

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass , occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

Given mass of ethanol = 0.2301

Molar mass of ethanol = 46.07 g/mol

$\text{Number of moles of ethanol}=\frac{0.2301g}{46.07g/mol}=4.994\times 10^{-3}$

Thus there are $4.994\times 10^{-3}$ moles of ethanol are present in the sample.

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4 years ago

Read 2 more answers

i have an unknown volume of gas at a pressure of 0.50 atm a temperature of 325 k. If i raise the pressure to 1.2 atm, decrease t

Ronch [10]

Assuming that the number of mols are constant for both conditions:
$\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}$
Now you plug in the given values. V_1 is the unknown.
$\frac{0.50 atm*V_1}{325K} = \frac{1.2 atm* 48 L}{230K}
$
Separate V_1
$V_1= \frac{1.2 atm* 48 L * 325K }{230K*0.50 atm }$
V= 162.782608696 L

There are 2 sig figs

V= 160 L

3 0

3 years ago

Push your palms against a wall. What happened?

Jlenok [28]

You push yourself away

7 0

3 years ago

By using mechanical advantage you can get more work out of any machine than what you put into it. True False

KengaRu [80]

True machines do help alot...

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3 years ago

For a solution, [H+] = 3 x 10-11M.<br> What is the pH?

BARSIC [14]

Answer:

pH≈10.5

Explanation:

-log(3 x 10-11)≈10.5

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3 years ago