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ArbitrLikvidat [17]

3 years ago

13

Which of the following releases the greatest amount of energy as it proceeds? Assume the same mass of starting material is used

in each.
A. solidification
B. condensation
C. nuclear reaction
D. chemical reaction

1 answer:

kupik [55]3 years ago

4 0

Chemical reaction is the answer

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3 years ago

When 1.95 g of co(no3)2 is dissolved in 0.350 l of 0.220 m koh, what are [ co2+], [ co(oh)42−], and [ oh−] if kf of co(oh)42− =

Airida [17]

Mass of Co(NO₃)₂ = 1.95 g
V KOH = 0.350 L
[KOH] = 0.220 M
Kf = 5.0 x 10⁹
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chemical reaction:
Co²⁺(aq) + 4 OH⁻ ⇄ Co(OH)₄²⁻
I (M) 0.03045 0.22 0
C (M) - 0.03045 - 4 (0.03045) 0.03045
E (M) - x 0.22 - 4(0.03045) 0.03045
= 0.0982
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x = 6.5489 x 10⁻⁸
at equilibrium:
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2 years ago

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We need to know the relationship between atmospheric pressure and the density of gas particles in an area of increasing pressure.

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For any gaseous substance, density of gas is directly proportional to pressure of gas.

This can be explained from idial gas edquation:

PV=nRT

PV= $\frac{w}{M}$ RT [where, w= mass of substance, M=molar mass of substance]

PM= $\frac{w}{V}$ RT

PM=dRT [where, d=density of thesubstance]

So, for a particular gaseous substance (whose molar mass is known), at particular temperature, pressure is directly related to density of gaseous substance.

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3 years ago