How much heat energy would be needed to raise the temperature of a 223 g sample of aluminum [(C=0.895 Jig Cy from 22.5°C to 55 0°C? Η Ο Ο Ο ΟΟ 10x10) not enough information given Prov 40 25 11 Next >

Answers

Answer 1
Answer:

Answer : The heat energy needed would be, 6486.5125 J

Explanation :

To calculate the change in temperature, we use the equation:

q=mc\Delta T\n\nq=mc(T_2-T_1)

where,

q = heat needed = ?

m = mass of aluminum = 223 g

c = specific heat capacity of aluminum = 0.895J/g^oC

\Delta T = change in temperature

T_1 = initial temperature = 22.5^oC

T_2 = final temperature = 55.0^oC

Putting values in above equation, we get:

q=223g* 0.895J/g^oC* (55.0-22.5)^oC

q=6486.5125J

Therefore, the heat energy needed would be, 6486.5125 J


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assume in a different experiment, you prepare a mixture containing 10.0 M FeSCN2+, 1.0 M H+, 0.1 MFe3+ and 0.1 M HSCN. Is the initial mixture at equilibrium? If not, in what direction must the reactionproceed to reach equilibrium? (Hint: You will need to use the value of Kc you determined in the lab

Answers

Answer:

The mixture is not in equilibrium, the reaction will shift to the left.

Explanation:

Based on the equilibrium:

Fe³⁺+ HSCN ⇄ FeSCN²⁺ + H⁺

kc = 30 = [FeSCN²⁺] [H⁺] / [Fe³⁺] [HSCN]

Where [] are concentrations at equilibrium. The reaction is in equilibrium when  the ratio of concentrations = kc

Q is the same expression than kc but with [] that are not in equilibrium

Replacing:

Q = [10.0M] [1.0M] / [0.1M] [0.1M]

Q = 1000

As Q > kc, the reaction will shift to the left in order to produce Fe³⁺ and HSCN untill Q = Kc

Final answer:

The mixture's equilibrium status can be determined by comparing the reaction quotient (Q) with the equilibrium constant (Kc). If Q < Kc, the reaction proceeds to the right (products) to achieve equilibrium. If Q > Kc, the reaction proceeds to the left (reactants) to achieve equilibrium.

Explanation:

To determine if the mixture is initially at equilibrium, we need to calculate and compare the reaction quotient (Q) and the equilibrium constant (Kc) of the reaction. The reaction quotient is a measure of the relative concentrations of products and reactants at any point in time, whereas Kc, is the measure of these concentrations only at equilibrium.

Assuming that the reaction in question is: Fe3+ + HSCN ↔ FeSCN2+ + H + . In this case,

Q = [FeSCN2+]/[Fe3+][HSCN] = 10 / (0.1 * 0.1) = 1000. If Kc is less than 1000, the reaction is not at equilibrium and will need to proceed to the left (reactants) to reach equilibrium. Conversely, if Kc is greater than 1000, the reaction is not at equilibrium and will need to proceed to the right (products).

Learn more about Chemical Equilibrium here:

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How is energy transfer connected to your life

Answers

Answer:

Baking, microwave, heating system for your house, water boiler, fridge.

The length of the marathon race is approximately 26.2 mi. What is the distance in kilometers?

Answers

Answer : The distance in kilometers is, 42.2 km

Explanation :

As we are given that the length of the marathon race is 26.2 mile. Now we have to determine the distance in kilometers.

The conversion used for distance from mile to kilometer is:

1 mile = 1.609 km

As, 1 mile = 1.609 km

So, 26.2 mile = \frac{26.2\text{ mile}}{1\text{ mile}}* 1.609km

                      = 42.2 km

Thus, the distance in kilometers is, 42.2 km

Answer: 42.16481

Explanation:

What is the concentration of hydronium ion ( [H3O+]) in a solution with a PH of _1,3?

Answers

Answer: [H3O+]= 0.05 M

Explanation:

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A balloon filled with 0.500 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.25 atm. What is the volume of the balloon at this depth? a. 0.154 L b. 6.50 L c. 0.615 L d. 1.63 L d. None of the above

Answers

"0.154 L" is the volume of the balloon.

Given:

Pressure,

  • P_1 = 1 \ atm
  • P_2 = 3.25 \ atm

Volume,

  • V_1 = 0.5 \ L
  • V_2 = ?

As we know,

P_1. V_1 = P_2 .V_2

or,

→      V_2 = (P_1. V_1)/(P_1)

By substituting the values, we get

            = (0.5* 1)/(3.25)

            = (0.5)/(3.25)

            = 0.154 \ L

Thus the above answer i.e., "option a" is correct.

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Answer:

Option a . 0.154L

Explanation:

P₁ . V₁ = P₂ . V₂

when we have constant temperature and constant moles for a certain gas.

At sea level, pressure is 1 atm so:

0.5 L . 1atm = V₂ . 3.25 atm

(0.5L . 1atm) / 3.25 atm = 0.154 L

1. Potassium (K) has an atomic mass of 39.0983 amu and only two naturally-occurring isotopes. The K-41 isotope (40.9618 amu) has a natural abundance of 6.7302%. What is the mass (in amu) of the other isotope

Answers

Answer:

38.96383282 amu

Explanation:

39.0983 = (40.9618 * 0.067302) + ( ? * (1-0.067302)

39.0983 = 2.756811064 + ( ? * 0.932698)

subtract 2.756811064 from both sides

36.34148894 = ( ? * 0.932698)

divide both sides by 0.932698

? = 38.96383282 amu

Answer:

38.96383282 amu

Explanation:

39.0983 = (40.9618  0.067302) + ( ?  (1-0.067302)

39.0983 = 2.756811064 + ( ?  0.932698)

subtract 2.756811064 from both sides

36.34148894 = ( ?  0.932698)

divide both sides by 0.932698

? = 38.96383282 amu