If the stove top tries to heat the same amount (in mass) of oil (heat capacity 2

Question

If the stove top tries to heat the same amount (in mass) of oil (heat capacity 2.0 L/g degree C) as in problem 23 on the same stove top, then the time it take to heat the oil 70 degrees will be approximately 4.18/2.0 * answer to #23 2.0/4.18 * answer to #23 4.18/2.0*70 * answer to #23 2.0/(4.18*70) * answer to #23 If a 15 gram piece of aluminum metal (specific heat capacity 0.902 J/g degree C) at 110 degree C is dropped into 45 grams of ethylene glycol (specific heat capacity 2.200 J/g degree C) at 60 degree C what is the final temperature of the ethylene glycol? -87 degree C 66 degree C 87 degree C 116 degree C If the pH value of 0.05M HCl is 1.30, then the pH of H_2SO_4 must be (Note: The K, value for HCl and the K_a1 value for H_2SO_4 are both very large; the K_a2 for HSO_4^- iS 1.3 times 10^-2, you can estimate the answer without using the quadratic formula!) 1.30 2.60 1.00 1.23

Explanation / Answer

25)

Heat released by aluminium metal = Heat gained by ethylene glycol

Let the final temperature of the solution be T Celsius

mass(Al) * specific heat(Al) * (change in temperature) = mass(ethylene glycol) * specific heat(ethylene glycol) * change in temperature

15 * 0.92 * (110-T) = 45 * 2.200 * (T-60)

110 - T = 7.173T - 430.434

8.173T = 540.434

T = 66.124 C

Hence the correct answer is Option B

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