Why might it be important to identify isoelectronic ions/atoms?

Chemistry

1 answer:

polet [3.4K]2 years ago

5 0

Answer:

Isoelectronicity may be used to predict the properties and reactions of a species. It is used to identify hydrogen-like atoms, which have one valence electron and are thus isoelectronic to hydrogen.

Explanation:

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Determine the molecular mass of a gas where 3.87 g occupies 0.896 l at standard conditions.

Arturiano [62]

Let's assume that the gas has ideal gas behavior.

Ideal gas law,
PV = nRT (1)

Where, P is the pressure of the gas (Pa), V is the volume of the gas (m³), n is the number of moles of gas (mol), R is the universal gas constant ( 8.314 J mol⁻¹ K⁻¹) and T is temperature in Kelvin.

n = m/M (2)

Where, n is number of moles, m is mass and M is molar mass.

From (1) and (2),
PV = (m/M) RT

By rearranging,
M = (mRT)/PV (3)

P = standard pressure = 1 atm = 101325 pa
V = 0.896 L = 0.896 x 10⁻³ m³
R = 8.314 J mol⁻¹ K⁻¹
T = Standard temperature = 273 K
m = 3.87 g = 3.87 x 10⁻³ kg
M = ?

By appying the formula,
M =(3.87 x 10⁻³ kg x 8.314 J mol⁻¹ K⁻¹ x 273 K) /101325 pa x 0.896 x 10⁻³m³
M = 0.0967 kg
M = 96.7 g.

Hence, the molar mass of the gas is 96.7 g.

5 0

3 years ago

if an unknown gas has one third the root mean squarevspeed of H2 at 300 K, what is the molar mass of the gas?

Viefleur [7K]

The molar mass of the gas : 18 x 10⁻³ kg/mol

<h3>Further explanation</h3>

Given

An unknown gas has one third the root mean square speed of H2 at 300 K

Required

the molar mass of the gas

Solution

Average velocities of gases can be expressed as root-mean-square (V rms)

$\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}$

T = temperature, Mm = molar mass of the gas particles , kg/mol

R = gas constant 8,314 J / mol K

v rms An unknown gas = 1/3 v rms H₂

v rms H₂ :

$\tt v_{rms}=\sqrt{\dfrac{3\times 8.314\times 300}{2.10^{-3}} }\\\\v_{rms}=1934.22$

V rms of unknown gas =

$\tt \dfrac{1}{3}\times 1934.22=644.74$

$\tt 644.74^2=\dfrac{3\times 8.314\times 300}{M_{gas}}\\\\M_{gas}=18\times 10^{-3}~kg/mol$

7 0

3 years ago

The red spheres represent oxygen atoms, and the blue spheres represent hydrogen atoms. Is this substance a compound?

Nimfa-mama [501]

I believe a compound, be definition, needs to be composed of different types of atoms, so it sounds like yeah, assuming the oxygen and hydrogen atoms are actually bonded together and not just floating randomly.

7 0

3 years ago

Read 2 more answers

What is the hydroxide ion concentration of a solution with a ph of 8. 25?

miss Akunina [59]

The concentration of hydroxide ion of a solution with a pH of 8. 25 is 1.77× $10^{6}$ M

Calculation,

The pH of a solution tells us about concentration of the $H^{+$ ion ( proton ) in solution. However, if we know the value of pH , we can calculate pOH with the help of pH and from pOH we can find concentration of hydroxide ions in the solution.