Chemistry, 25.07.2019 14:00, something69

Asyringe containing 1.45 ml of oxygen gas is cooled from 90.4 ∘c to 0.5 ∘c. what is the final volume vf of oxygen gas? (assume that the pressure is constant.)

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Charles law gives the relationship between volume and temperature.
It states that at constant pressure, volume of gas is directly proportional to temperature of gas.
V/T = k
where k - constant
$\frac{V1}{T1} = \frac{V2}{T2}$
where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
temperature should be given in K
T1 - 90.4 °C + 273 = 363.4 K
T2 - 0.5 °C + 273 = 273.5 K
Substituting values in the equation
$\frac{1.45mL}{363.4 K} = \frac{V}{273.5K}$
V = 1.09 mL
Final volume is 1.09 mL

answered: Guest

the grams of barium that are in 2.3 x 10^23 atoms of barium is 52.4 g (answer c)

calculation

mass = moles of ba x molar mass of ba

molar mass of ba from periodic table= 137.3 g/mol

use the avogadro's law constant to calculate the moles of barium

that is 1 mole = 6.02 x 10^23 atoms

? moles = 2.3 x 10^23 atoms

by cross multiplication

=(1 mole x 2.3x 10^23 atoms) / 6.02 x10^23 atoms)= 0.382 moles

mass is therefore = 137.3 g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

answered: Guest

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

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Asyringe containing 1.45 ml of oxygen gas is cooled from 90.4 ∘c to 0.5 ∘c. what is the final volume...