Chemistry, 02.10.2019 21:10 Kykebailey2356

If you have 0.50 grams of p-aminophenol, how many mls of water will be needed if you are adding 20 molar equivalents? how many mls acetic anhydride will be required if you are adding 1.5 molar equivalents?

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Answer from: barloase5747

The volume of water required is 1.65 mL and the volume of acetic anhydride required is 0.65 mL

Explanation:

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

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

For p-aminophenol:

Given mass of p-aminophenol = 0.50 g

Molar mass of p-aminophenol = 109.14 g/mol

Putting values in equation 1, we get:

$\text{Moles of p-aminophenol}=\frac{0.50g}{109.14g/mol}=4.58\times 10^{-3}mol$

To calculate volume of solution, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$ ......(2)

For water:

It is given that 20 molar equivalent so p-aminophenol is added:

Moles of water = $(20\times \text{Moles of p-aminophenol})=20\times 4.58\times 10^{-3}=9.16\times 10^{-2}mol$

Mass of water is calculated by using equation 1, we get:

Molar mass of water = 18 g/mol

Mass of water = $(9.16\times 10^{-2}mol\times 18g/mol)=1.65g$

Now, calculating the volume of water by using equation 2, we get:

Density of water = 1 g/mL

Mass of water = 1.65 g

Putting values in equation 2, we get:

$1g/mL=\frac{1.65g}{\text{Volume of water}}\\\\\text{Volume of water}=\frac{1.65g}{1g/mL}=1.65mL$

Hence, the volume of water required is 1.65 mL

For acetic anhydride:

It is given that 1.5 molar equivalent so p-aminophenol is added:

Moles of acetic anhydride = $(1.5\times \text{Moles of p-aminophenol})=1.5\times 4.58\times 10^{-3}=6.87\times 10^{-3}mol$

Mass of acetic anhydride is calculated by using equation 1, we get:

Molar mass of acetic anhydride = 102.1 g/mol

Mass of acetic anhydride = $(6.87\times 10^{-3}mol\times 102.1g/mol)=0.701g$

Now, calculating the volume of acetic anhydride by using equation 2, we get:

Density of acetic anhydride = 1.08 g/mL

Mass of acetic anhydride = 0.701 g

Putting values in equation 2, we get:

$1.08g/mL=\frac{0.701g}{\text{Volume of acetic anhydride}}\\\\\text{Volume of acetic anhydride}=\frac{0.701g}{1.08g/mL}=0.65mL$

Hence, the volume of acetic anhydride required is 0.65 mL

Answer from: Quest

Sorry i don’t know i just need the points

Answer from: Quest

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

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If you have 0.50 grams of p-aminophenol, how many mls of water will be needed if you are adding 20 m...