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2 years ago

Help please! I dont understand, and im having a hard time in Science.

Chemistry

2 answers:

DENIUS [597]2 years ago

6 0

I think that's right like this

12345 [234]2 years ago

6 0

It was kinda hard to see where the arrows were pointing at but I tried my best.

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For every 4 hours that Alexa babysit her younger sister, her mom pays her $50

tiny-mole [99]

Answer:12.5

Explanation: Divide 50$ by the 4 hours and you will get 12.5 which is $12.50.

7 0

3 years ago

Read 2 more answers

A sample 0.100 moles of a gas is collected at at stp. what is the volume of the gas in liters? group of answer choices 2.44 l

bearhunter [10]

n = 0.100 moles

At STP (standard temperature pressure), where gas is collected, the temperature is 0°C and the pressure is 1 atm.

$\\$\therefore$ Temperature $(T)=0^{\circ} \mathrm{C}=0^{\circ}+273$

$=273K$

$Pressure $(P)=1$ atm.$

The ideal gas equation indicates that

$\begin{aligned}& P V=n R T \Rightarrow V=\frac{n R T}{P} \\\therefore & R=\text { gas constant }=0.0821 \mathrm{~L} \cdot \mathrm{cetm} / \mathrm{mo} / \cdot K\end{aligned}$

$\begin{aligned}&V=\frac{0.100 \mathrm{~mol} \cdot \times 0.0821 \mathrm{~L} \cdot \mathrm{atm} / \mathrm{mol} . \mathrm{K} \times 273 \mathrm{~K}}{1 \mathrm{~atm}} \\&V=\frac{2.24 L}{1}\end{aligned}\\$

$V=2.24L$

Group of answer choices $2.44L$ .The volume occupied by mole of a given gas at a given temperature and pressure is expressed as the gas's molar volume.

The most typical illustration is the molar volume of a gas at STP, which is equal to $2.44L$ for $1$ mole of any ideal gas at a temperature of $273.15$ Kand a pressure of $1$ atm.

Hence, the volume of the gas is $2.24L$ .

A unit is stated to have a temperature of absolute zero $(273 Kelvins)$ and an atmospheric pressure of one atmosphere, or $1$ atm, at standard temperature and pressure. Additionally, at STP, a mole of any gas takes up $22.414 L$ of space. Keep in mind that this idea only applies to gases.

For experimental measurements to be established under standard conditions that allow for comparisons between various sets of data, standard temperature and pressure must be met.

To learn more about STP, Visit:

brainly.com/question/1626157

#SPJ4

8 0

1 year ago

Use the normal boiling points: propane, C3H8, –42.1˚C; butane, C4H10, –0.5˚C; pentane, C5H12, 36.1˚C; hexane, C6H14, 68.7˚C; hep

svlad2 [7]

Answer:

The answer to your question is 126.1°C

Explanation:

Boiling point Difference of boiling points

C₃H₈ - 42.1°C

C₄H₁₀ - 0.5°C 41.6 °C

C₅H₁₂ 36.1°C 36.6°C 41.6 - 36.6 = 5°C

C₆H₁₄ 68.7°C 32.6°C 36.6 - 32.6 =4°C

C₇H₁₆ 98.4°C 29.7°C 32.6 - 29.7 = 2.9°C

We can observe on the table that the difference of boiling points diminishes 1°C when the hydrocarbon has one more carbon, then the difference of temperature between the hydrocarbon of 8 carbons and the hydrocarbon of 7 carbons must be 2°C.

So, this difference is 29.7°C - 2°C = 27.7°C.

And the boiling point of octane is approximately 98.4 + 27.7°C = 126.1°C

7 0

2 years ago

Help its a test and I’m pretty bad at these

saw5 [17]

B) just learn that you move the decimal right as numbers go higher and left if numbers decrease

So 1.75 km =1750000

Move decimal to the left to get a scientific notation

So 1.75 x 10^6

Brainliest?

8 0

3 years ago

Read 2 more answers

Ammonia can be determined spectrophotometrically by reaction with phenol in the presence of hypochlorite (OCl−):

Valentin [98]

Answer:

See explaination

Explanation:

Molar absorptivity, also known as the molar extinction coefficient, is a measure of how well a chemical species absorbs a given wavelength of light.

It is commonly used in chemistry and should not be confused with the extinction coefficient, which is used more often in physics.

Please kindly check attachment for the step by step solution of the given problem.

7 0

3 years ago