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Cerrena [4.2K]
3 years ago
13

Assume a reaction takes 7.5 moles of anhydrous calcium chloride and energy transfer occurs, which we record as 21.2 joules of en

ergy. Find the heat of solution in J/mol and round to two places after the decimal point.
Physics
2 answers:
OLga [1]3 years ago
8 0

Answer: 2.83 J/mol

Explanation:

Heat of solution, sometimes interchangeably called enthalpy of solution, is said to be the energy released or absorbed when the solute dissolves in the solvent. A solute is that which can dissolve in a solvent, to form a solution

Given

No of moles of CaCl = 7.5 mol

Total energy used = 21.2 J

Heat of solution = q/n where

q = total energy

n = number of moles

Heat of solution = 21.2 / 7.5

Heat of solution = 2.83 J/mol

netineya [11]3 years ago
3 0

Answer:

Heat of solution; ΔH = 2.83 J/mol

Explanation:

We are given;

Number of moles; n = 7.5 moles

Energy absorbed; q = 21.2 J

Now, in endothermic reactions,

ΔH = q/n

Where ;

ΔH is heat of solution

q is amount of energy absorbed

n is number of moles of solute

Thus, plugging in relevant values, we have;

ΔH = q/n

ΔH = 21.2/7.5

ΔH = 2.83 J/mol

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If your atom has a charge of +1, it means you have 1 more proton than electrons. This is because protons have a positive charge and electrons have a negative charge. Because you have 23 protons, and a charge of +1, you have 22 electrons.

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3 years ago
9. A pendulum bob is made with a ball filled with water. What would happen to the frequency of vibration of this pendulum if a h
Ilya [14]

Answer:

The frequency of vibration will be unchanged.

Explanation:

The frequency of oscillation of a simple pendulum is given by

f = \dfrac{1}{2 \pi}\sqrt{\dfrac{g}{L}}

where, g is the acceleration due to gravity and L is the length of the pendulum.

It can be seen from the formula that the frequency of the pendulum is independent of the mass.

Thus, the frequency of vibration will be same.

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3 years ago
Theres no way i can walk this road alone.....
Paladinen [302]

Answer:

Theres no way i can walk this road alone Well, daddy grabbed my hand and said

Explanation:

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2 years ago
the roque requried to turn the crank on an ice cream maker is 4.50 N.m how much work does it take to turn the crank through 300
Alexus [3.1K]

Answer:

the work required to turn the crank at the given revolutions is 8,483.4 J

Explanation:

Given;

torque required to turn the crank, T = 4.50 N.m

number of revolutions, = 300 turns

The work required to turn the crank is given as;

W = 2πT

W = 2 x 3.142 x 4.5

W = 28.278 J

1 revolution = 28.278 J

300 revlotions = ?

= 300 x 28.278 J

= 8,483.4 J

Therefore, the work required to turn the crank at the given revolutions is 8,483.4 J

4 0
3 years ago
a boy throw a ball upward from the top of a cliff 73m high.Calculate the time in which ball will fall on the ground and the velo
LekaFEV [45]

The ball rises for v/g seconds; which equals 14.7/9.8=1.5 seconds . After this time, it’s height will be:


h(t)=g/2(1.5)²+14.7(1.5)


=-4.9 x 2.25 + 22.05


=11.025m


The ball then falls for 49+11.025=60.025m, which takes:


g/2t²=60.025


t²=12.25


t=3.5 secs


Total time: 1.5+3.5=5 seconds

3 0
3 years ago
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