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What text features were used? font color, shadow, and bold font color, italics, and outline font color, italics, and bold font c

olor, shadow, and outline

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AlladinOne [14]3 years ago

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Answer:

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Calculate the vapor pressure (in torr) at 298 K in a solution prepared by dissolving 46.8 g of the non-volatile non-electrolye g

Rainbow [258]

<u>Answer:</u> The total partial pressure of the solution is 131.37 torr.

<u>Explanation:</u>

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

<u>For glucose:</u>

Given mass of glucose = 46.8 g

Molar mass of glucose = 180 g/mol

Plugging values in equation 1:

$\text{Moles of glucose}=\frac{46.8g}{180g/mol}=0.26 mol$

<u>For methanol:</u>

Given mass of methanol = 117 g

Molar mass of methanol = 32 g/mol

Plugging values in equation 1:

$\text{Moles of methanol}=\frac{117g}{32g/mol}=3.66 mol$

Mole fraction is defined as the moles of a component present in the total moles of a solution. It is given by the equation:

$\chi_A=\frac{n_A}{n_A+n_B}$ .....(2)

where n is the number of moles

Putting values in equation 2:

$\chi_{methanol}=\frac{3.66}{0.26+3.66}=0.934$

Raoult's law is the law used to calculate the partial pressure of the individual gases present in the mixture. The equation for Raoult's law follows:

$p_A=\chi_A\times p_T$ .....(3)

where $p_A$ is the partial pressure of component A in the mixture and $p_T$ is the total partial pressure of the mixture

We are given:

$p_{methanol}=122.7torr\\\chi_{methanol}=0.934$

Putting values in equation 3, we get:

$122.7torr=0.066\times p_T\\\\p_T=\frac{122.7torr}{0.934}=131.37torr$

Hence, the total partial pressure of the solution is 131.37 torr.

3 0

3 years ago

A student was conducting an experiment in the laboratory that had a temperature of 272 °C. The student needed to log the tempera

lozanna [386]

Answer:

d 545K

Explanation:

0°C = 273K

so, 272°C = (273+272)K

8 0

2 years ago

The volume of a fixed amount of gas is doubled, and the absolute temperature is doubled. According to the ideal gas law, how has

Vedmedyk [2.9K]

The ideal gas laws may be collectively expressed mathematically as:
PV/T = constant
Therefore, we may use this to determine the final pressure by equating the initial and final conditions:
PV/T = P * 2V / 2T
PV/T = PV/T
P = P
Therefore, the pressure is unchanged. It has stayed the same.

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4 years ago

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Which element would have a similar chemical reaction as lithium (Li)? *

rodikova [14]

Answer:

Sodium (Na)

because it belongs to the first group of the periodic table. Therefore its properties are similar to that of lithium.

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3 years ago

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Explain why scientists use shared characteristics to make cladograms.

Sauron [17]

Scientist use synapomophies, or shared derived characters, to define cladograms. For instance, mammary glands are a shared characteristic of mammals. All mammals and their oldest common ancestor, had or have mammary glands.Thus, if we are looking at an unidentified animal and trying to place it in a cladogram, if it has mammary glands we know it belongs in that branch. Cladogram is a diagram used to represent a hypothetical relationship between groups of animals, called a phylogeny. A cladogram is used by a scientist studying phylogenetic systematics to visualize the groups of organisms being compared, how they are related, and their most common ancestors.

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3 years ago

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