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3 years ago

When performing dimensional analysis, we usually use conversion factors. What is a conversion factor?

Chemistry

1 answer:

lora16 [44]3 years ago

4 0

Answer:

A conversion factor is a variable that transforms the dimension of one variable into the terms of another variable.

Explanation:

Let be $x$ and $y$ two variables with diferent dimensions (units), $r$ is a conversion if transforms the dimension of one variable into the terms of the other variable. That is:

$y = r\cdot x$ (1)

Where:

$x$ - Input, [input unit]

$y$ - Output, [output unit]

$r$ - Conversion factor, [output unit] per [input unit]

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A 21.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter, according to the following reaction. If the temperature ris

Blababa [14]

Answer: The heat capacity of calorimeter is $15.66J/^oC$

Explanation:

To calculate the number of moles, we use the equation:

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

Given mass of ethanol = 21.8 g

Molar mass of ethanol = 46.07 g/mol

Putting values in above equation, we get:

$\text{Moles of ethanol}=\frac{21.8g}{46.07g/mol}=0.473mol$

To calculate the enthalpy change of the reaction, we use the equation:

$\Delta H_{rxn}=\frac{q}{n}$

where,

$q$ = amount of heat released = ?

n = number of moles = 0.473 moles

$\Delta H_{rxn}$ = enthalpy change of the reaction = -1235 kJ/mol = $-1235\times 10^3J/mol$ (Conversion factor: 1 kJ = 1000 J)

Putting values in above equation, we get:

$-1235\times 10^3J/mol=\frac{q}{0.473mol}\\\\q=(-1235\times 10^3J/mol\times 0.473mol)=-584.16\times 10^3J$

To calculate the heat capacity of calorimeter, we use the equation:

$q=c\Delta T$

where,

q = heat absorbed by the calorimeter = $584.16\times 10^3J$

c = heat capacity = ?

$\Delta T$ = change in temperature = $T_2-T_1=62.3^oC-25^oC=37.3^oC$

Putting values in above equation, we get:

$584.16\times 10^3J=c\times 37.3^oC\\\\c=\frac{584.16\times 10^3J}{37.3^oC}=15.66J/^oC$

Hence, the heat capacity of calorimeter is $15.66J/^oC$

4 0

3 years ago

please help pls help 20 points Which of the following is a myth about water conservation? An important part of water conservatio

nordsb [41]

Answer:

Air-drying clothes conserves more water than using an electric clothes dryer.

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3 years ago

The pressure at the top of Mount Everest is 33.7 kPa. Is this greater or less than 0.25 atm?

Fantom [35]

Answer:1 atm = 101,325 Pa

So, you convert 33.7 KPa to Pa and divide by 101,325, as follows:

3.7 KPa (1 x 10^3Pa / 1 KPa) (1 atm / 101,325 Pa) = .33 atm

As you can see 33.7 KPa, which is equal to .33 atm, is greater than 0.25.

Explanation: why didnt you just look this up jeez

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3 years ago

Which statements describe both male and female reproductive systems? Select three options

worty [1.4K]

Answer:

A:The reproductive system produces hormones.

B:The reproductive system transports reproductive cells.

C:The reproductive system produces reproductive cells.

Explanation:

A:The reproductive system produces hormones. : The reproductive organs ovaries in females and testes in males produces hormones. The ovaries produce estrogen and progesterone and testes produce testosterone.

B:The reproductive system transports reproductive cells. : The ovaries in females transfers an egg into the fallopian tube and testes in males secrete sperms at the time of copulation the fertilization of egg and sperm leads to the development of zygote the precursor of new life.

C:The reproductive system produces reproductive cells.: The ovaries undergo oogenesis and in testes spermatogenesis takes place to develop egg and sperms respectively.

Explanation:

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2 years ago

What happens to light as it hits the surfaces of two media at an angle?

vivado [14]

Answer:

Explanation:

When a light ray strikes the interface between two mediums, it is refracted through an angle that depends on the index of refraction of each material and the ray's angle of incidence, as measured relative to the normal (perpendicular) between the surfaces.

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2 years ago