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3 years ago

Does data from mass spectrometry indicate that modern scientists have made modifications to Dalton''s model? Justify.

1 answer:

5 0

John Dalton was a scientist who proposed that all matter consists of atoms. At this stage, no one had yet discovered neutrons and the nucleus. As a result, Dalton's model consisted of a single atom i.e. the atom was the smallest object.
A mass spectrometer is an instrument that is able to see what is inside an atom. Scientists have been able to prove that the item is not the smallest object in the world. Atoms are made up of smaller objects called protons, neutrons and electrons.
We can, therefore, safely conclude that data from mass spectrometry has helped modern scientists to make modifications to Dalton's model. <span>
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Express the concentration of a 0.0390 M aqueous solution of fluoride, F–, in mass percentage and in parts per million. Assume th

mart [117]

<span>ppm = mg/L
or
Kg solution Mass % = Mass of Solute/Mass of solution

0.0390 M = x moles/1L
x = 0.0390 Moles of F-
0.0390 mol x 18.998403 g/mol = 0.7409 g

PPM:
1mg = 1000g
0.7409g = 740.9mg
740.9mg/1L = 740.9mg

Mass Percent:
density 1 g/mL
thus
1 g = 1 mL
thus 1 L = 1 kg
thus 1 L = 1000 g
so,
(0.7409 g/1000 g)*100
= 0.07409% (m/m)</span>

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3 years ago

Calculate the vapor pressure at 25°C of a solution containing 55.3 g ethylene glycol (HOCH2CH2OH) and 285.2 g water. The vapor p

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Answer:

Vapor pressure of solution = 23.9 Torr

Explanation:

Let's apply the colligative poperty of vapor pressure to solve this:

ΔP = P° . Xm

ΔP = Vapor pressure of pure solvent - Vapor pressure of solution

We have solvent and solute mass, so let's find out the moles of each.

55.3 g / 62 g/mol = 0.89 moles

285.2 g / 18 g/mol = 15.84 moles

Let's determine the mole fraction of ethylene glycol.

Mole fraction = Moles of ethylene glyco / Total moles

0.89 moles / (0.89 + 15.84) = 0.053

25.3 Torr - Vapor pressure of solution = 25.3 Torr . 0.053

Vapor pressure of solution = 25.3 Torr . 0.053 - 25.3 Torr

Vapor pressure of solution = 23.9 Torr

7 0

3 years ago

Read 2 more answers

What is thermoplastics?

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Answer:

A thermoplastic is any plastic material with a low melting point that becomes molten when heated, solid when cooled, and can be re-melted or molded after cooling. The curing process is completely reversible, and doing so will not compromise the material's physical integrity.

Credit to:https://www.fastradius.com/resources/thermoplastics-thermosets/#:~:text=A%20thermoplastic%20is%20any%20plastic,compromise%20the%20material's%20physical%20integrity.

Explanation:

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3 years ago

What factor would affect the pH of a waterway?

just olya [345]

Acid Rain. Hope i helped you!

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4 years ago

A solution was made by mixing 60.5 g of glucose (C6H12O6) with enough water to make 325 ml of solution. What is the percent (mas

IgorC [24]

mass percent concentration = 15.7 %

molar concentration of glucose solution 1.03 M

Explanation:

To calculate the mass percent concentration of the solution we use the following formula:

concentration = (solute mass / solution mass) × 100

solute mass = 60.5 g

solution mass = solute mass + water mass

solution mass = 60.5 + 325 = 385.5 g (I used the assumption that the solution have a density of 1 g/mL)

concentration = (60.5 / 385.5) × 100 = 15.7 %

Now to calculate the molar concentration (molarity) of the solution we use the following formula:

molar concentration = number of moles / volume (L)

number of moles = mass / molecular weight

number of moles of glucose = 60.5 / 180 = 0.336 moles

molar concentration of glucose solution = 0.336 / 0.325 = 1.03 M

Learn more about:

molarity

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#learnwithBrainly

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4 years ago