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3 years ago

How many significant digits are in the volume measurement 4010,0 mL? A) 2 B) 3 C) 4 D) 5 E) none of the above

Chemistry

1 answer:

Lapatulllka [165]3 years ago

5 0

Answer: Option (D) is the correct answer.

Explanation:

Significant digits are defined as the digits which contribute meaning to the resolution of a number.

For example, if a digit is 40.0 ml then zero placed after the decimal point is not considered a significant because it doesn't contribute any value to the total quantity or number.

But zero placed in 40 will be considered significant because it tells us the number is forty. Hence, in 40.0 there are only 2 significant digits.

Similarly, in 4010,0 mL there are in total 5 significant digits.

Thus, we can conclude that there are 5 significant digits in the volume measurement 4010,0 mL.

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Explanation:
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P2 = P1V1/V2
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3 years ago

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3 years ago

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Assume at exactly 100.0°c and 1.00 atm total pressure, 1.00 mole of liquid water and 1.00 mole of water vapor occupy 18.80 ml an

Grace [21]

Answer 1) : When we calculate the ΔQ = -40.66 kJ (heat of vaporisation).

Then, we can relate the work done with this equation,

ΔW = -PΔV

First we need to calculate the volume, which will be,

Volume of water vapor = (nRT) / (P)

Then, V = (1 mole) X (0.0821 L X atm/mole X K) X (373.15K) / (1atm) = 30.6 liters So, it is given, and verified.

Volume of Water can be used for finding the; Density = M / V

D = ( 1 mole) X (18.02 g/mole) / (18.80 mL) = 0.9585 g/mL

On, substituting the values, we get,

ΔW = -PΔV

Work = - (1 atm) X (0.00188L - 30.62L) X 0.1013kJ/L X atm = 3.10 kJ

hence the work done is 3.10 kJ

Answer 2) Now, for calculating the internal energy, we can use the formula as,

ΔE = ΔQ + ΔW

Here, we have the values of ΔQ = -40.66 kJ and ΔW as = 3.10 kJ

So, we get, ΔE = (-40.66) + (3.10) = - 37.55 kJ

Therefore, the change in the internal energy will be -37.55 kJ.

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3 years ago

Design a concept map that shows the relationships among the following terms: volume , derived unit , mass , base unit , time , a

Svetlanka [38]

Base unit is the fundamental unit of measurement that is not mutually dependent. The seven base units are,

Length - meter

Mass- kilogram

Time - second

Temperature - Kelvin

Current - Ampere

Luminous intensity - Candela

Amount of matter - mole

Derived units are derived from the seven base units. Like the area (square meters) is the square of length (meters), volume is the cube of length.

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3 years ago

Arrange the eluting power of the listed solvents in normal-phase chromatography. The highest eluting power solvent is number 1;

BabaBlast [244]

Answer:

Explanation:

Part a

Normal Phase Chromatography

In the normal phase chromatography, the eluting power is highest for the solvent which has the highest polarity.

So from the given solvents as Methanol, Dichloromethane and Ethyl Acetate

the relative polarities are given as

Methanol=0.762

Dichloromethane (methylene chloride)=0.309

Ethyl Acetate=0.228

So the numbers are given as

Methanol :1

Dichloromethane (methylene chloride):2

Ethyl Acetate:3

Reverse Phase Chromatography

In the reverse phase chromatography, the eluting power is highest for the solvent which has the lowest polarity.

So from the given solvents as diethyl ether , water and toluene

the relative polarities are given as

Diethyl ether=0.117

Water=1.0

Toluene=0.099

So the alphabets are given as

Toluene :A

Diethyl ether: B

Water:C

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3 years ago