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4 years ago

5

As you move from left to right across a period, what happens to the atomic radil?

1 answer:

egoroff_w [7]4 years ago

4 0

Answer:

Moving Across a Period

Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons

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0.65 moles of O2 originally at 85°C is cooled

soldier1979 [14.2K]

Answer:

2.09 atm

Explanation:

We can solve this problem by using the equation of state for an ideal gas, which relates the pressure, the volume and the temperature of an ideal gas:

$pV=nRT$

where

p is the pressure of the gas

V is its volume

n is the number of moles

R is the gas constant

T is the absolute temperature

In this problem we have:

n = 0.65 mol is the number of moles of the gas

V = 8.0 L is the final volume of the gas

$T=40C+273=313 K$ is the temperature of the gas

$R=0.082 atm L mol^{-1} K^{-1}$ is the gas constant

Solving for p, we find the final pressure of the gas:

$p=\frac{nRT}{V}=\frac{(0.65)(0.082)(313)}{8.0}=2.09 atm$

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