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faust18 [17]
3 years ago
8

In your own words,provide 2 advantages of using meters as a measurement of length rather than old measurements of length such as

hands and steps
Chemistry
1 answer:
Dafna1 [17]3 years ago
7 0

Answer:

1.Accuracy

2.Acceptance

Explanation:

1. The first advantage is Accuracy. Using meters gives us a far more precise unit of measurement because of the exact scale of reading whereas hands and steps are more of approximate methods as they may not be as accurate as the using meter due to lack of exact scale of reading.

2. The second advantage is Acceptance. Usage of meter as a unit of measurement of length is now a widely accepted unit of measurement whereas, hands and steps are not widely accepted due to their approximate nature as compared to the exact nature of metres.

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Answer:

A sample of helium gas has a volume of 620mL at a temperature of 500 K. If we ... to 100 K while keeping the pressure constant, what will the new volume be?

Explanation:

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At what height the acceleration due to gravity of the earth become half ?​
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Acceleration due to gravity is reduced to half its value on the earth's surface at an altitude of 2.65×106 m

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Which statement best describes the properties of ionic compounds? They are brittle, solid at room temperature, and have a high m
djverab [1.8K]
They are good conductors of heat and electricity.

They are solid at room tempature

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3 years ago
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A 2. 75-l container filled with co2 gas at 25°c and 225 kpa pressure springs a leak. When the container is re-sealed, the pressu
Serjik [45]

The number of moles of gas lost is  0.0213 mol. It can be solved with the help of Ideal gas law.

<h3>What is Ideal law ?</h3>

According to this law, "the volume of a given amount of gas is directly proportional to the number on moles of gas, directly proportional to the temperature and inversely proportional to the pressure. i.e.

PV = nRT.

Where,

  • p = pressure
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  • T =  absolute temperature
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  • R =  gas constant, 8.314 J*(mol-K)

Therefore, the number of moles is

n = PV / RT

State 1 :

  • T₁ = (25⁰ C = 25+273 = 298 K)
  • p₁ = 225 kPa = 225 x 10³ N/m²

State 2 :

  • T₂ = 10 C = 283 K
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The loss in moles of gas from state 1 to state 2 is

Δn = V/R (P₁/T₁ - P₂/T₂ )

V/R = (1.75 x 10⁻³ m³)/(8.314 (N-m)/(mol-K) = 2.1049 x 10⁻⁴ (mol-m²-K)/N

p₁/T₁ = (225 x 10³)/298 = 755.0336 N/(m²-K)

p₂/T₂ = (185 x 10³)/283 = 653.7102 N/(m²-K)

Therefore,

Δn = (2.1049 x 10⁻⁴ (mol-m²-K)/N)*(755.0336 - 653.7102 N/(m²-K))

    = 0.0213 mol

Hence, The number of moles of gas lost is 0.0213 mol.

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Most substances become less dense as the temperature increases. Which substance is an exception to this rule
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