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3 years ago

Which measurement describes the pressure of a gas?

Chemistry

1 answer:

pychu [463]3 years ago

3 0

Answer:

725 mmHg

Explanation:

mmHg is a sort of unit to determine pressure.

g/L, is a unit for density

2.5L is a value for volume

315K is a value for Asbolute T° (Kelvin grade)

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Calculate the mass of water vapour present in a room of volume 400 m3 that contains air at 27 °C on a day when the relative humi

Alex73 [517]

Answer:

Mass of water = 6251. 706g or 6.25Kg

Explanation:

Relative humidity = (actual vapor pressure/saturation vapor pressure) * 100%

Actual vapor pressure, Pw = relative humidity * saturation vapor pressure

Pw = 60% * (35.6 *0.001)atm = 0.0216atm

Note: 1mbar = 0.001atm

Using the ideal gas equation: PV=nRT; where P = Pw= 0.02136atm, V= (400

* 1000)dm^3, R= 0.082 atmdm^3/kmol, T= (27+273)K, n = number of moles

Note: 1m^3 = 1000dm^3,R is the molar gas constant.

Making n subject of the formula, n = PV/RT

n= (0.02136 * 400000)/(0.082 * 300) = 347.317 moles

Mass (g) = number of moles (n) * molar mass

molar mass of water=18g

Mass of water = 347.317 * 18 = 6251. 706g or 6.25Kg

6 0

3 years ago

What is the ratio of [a–]/[ha] at ph 2.75? the pka of formic acid (methanoic acid, h–cooh) is 3.75?

Varvara68 [4.7K]

The dissociation of formic acid is:

$HCOOH \rightleftharpoons HCOO^{-} + H^{+}$

The acid dissociation constant of formic acid, $k_a$ is:

$k_a = \frac{[HCOO^{-}] [H^{+}]}{HCOOH}$

Rearranging the equation:

$\frac{[HCOO^{-}]}{[HCOOH]} = \frac{k_a}{[H_+]}$

pH = 2.75

$pH = -log[H^{+}]$

$[H^{+}]= 10^{-2.75} = 1.78 \times 10^{-3}$

$pk_a = 3.75$

$k_a = 10^{-3.75} = 1.78\times 10^{-4}$

Substituting the values in the equation:

$\frac{[HCOO^{-}]}{[HCOOH]} = \frac{k_a}{[H_+]}$

$\frac{[HCOO^{-}]}{[HCOOH]} = \frac{1.78\times 10^{-4}}{1.78\times 10^{-3}}$

Hence, the ratio is $\frac{1}{10}$ .

4 0

3 years ago

PLEASE HELP ME FAST!! How many moles are contained in 500 mL of a 3.5M NaOH solution?

viva [34]

Answer:

1.75moles

Explanation:

Molarity = number of moles (n) ÷ volume (V)

According to the information given in this question,

V = 500mL = 500/1000 = 0.500L

n = ?

Molarity = 3.5M

Using Molarity = n/V

number of moles (n) = V × molarity

n = 0.5 × 3.5

n = 1.75moles.

5 0

3 years ago

Which subatomic particle carries a negative charge?

olga_2 [115]

Answer:

Electron.

Explanation:

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Maru [420]

Answer:

errccvbnnbb

Explanation:

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2 years ago

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