Chemistry: What is the mass of 5.00 x 1024 molecules of NH3?

What is the mass of 5.00 x 1024 molecules of NH3?

Ответ:

johnnny7495

12.02.2020

Chemistry

0.0746 grams of hydrogen

Explanation:

To calculate the mass of hydrogen :

(Vapor pressure of water is 23.78 mmHg at 25 ∘C )

$2H^+(aq)+Zn(s)\rightarrow H_2(g)+Zn^{2+}(aq)$

According to avogadro's law, 1 mole of every substance occupies 22.4 L at NTP, weighs equal to the molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

According to the ideal gas equation:

PV=nRT

P = Total Pressure = 752 mm Hg

pressure of hydrogen = Total Pressure - Vapor pressure of water = (752 -23.78 )mm Hg = 728.22 mm Hg = 0.958 atm (760mmHg=1atm)

V= Volume of the gas = 0.953 L

T= Temperature of the gas = 25°C = 298 K

R= Gas constant = 0.0821 atmL/K mol

n= moles of gas= ?

$n=\frac{PV}{RT}=\frac{0.958\times 0.953}0.0821\times 298}=0.0373moles$

Mass of $H_2=moles\tims {\text {molar mass}}=0.0373mol\times 22g/mol=0.0746g$

Thus 0.0746 grams of hydrogen is collected.

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What is the mass of 5.00 x 1024 molecules of NH3?

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