Chemistry, 05.02.2021 21:00 fanta47

A solution is prepared by dissolving 25.0 mL ethanol, CH3CH2OH (d=0.789 g/mL), in enough water to produce 250.0 mL solution. What is the molarity of ethanol in the solution?

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Answer from: rsinchevici7843

The molarity of ethanol in the solution is 1.716M

What is the molarity of a solution?

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

Determine the mass of ethanol :

Mass of ethanol = 25 ml x 0.789 g/ml

Mass of ethanol = 19.725 g

Determine the moles of ethanol

Moles = Mass/Molar mass

Moles = 19.725 g/46 g/mol

Moles of ethanol = 0.429moles

Calculate the molarity using the formula below;

Molarity = Moles/Volume

Molarity = 0.429/0.25 L

Molarity = 1.716 M

Hence the molarity of ethanol in the solution is 1.716M

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Answer from: colexie7410

The molarity = 1.716 M

Further explanation

Given

25 ml ethanol

d = 0.789 g/ml

250 ml solution

Required

The molarity

Solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

$\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}$

mass of ethanol :

= 25 ml x 0.789 g/ml

= 19.725 g

mol ethanol :

= 19.725 g : 46 g/mol

= 0.429

The molarity :

= 0.429 : 0.25 L

= 1.716 M

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

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A solution is prepared by dissolving 25.0 mL ethanol, CH3CH2OH (d=0.789 g/mL), in enough water to pr...

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