A small pebble is heated and placed in a foam cup calorimeter containing 25.0 mL of water at 23.0°C.

Chemistry
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A small pebble is heated and placed in a foam cup calorimeter containing 25.0 mL of water at 23.0°C. The water reaches a maximum temperature of 24.2°C. How many joules of heat were released by the pebble? (The specific heat capacity of water is 4.18 J/g•°C and the density of water is 1.00 g/mL)

a.208 b.J138 c.J145 d.J125 J

Apr 19th, 2015

Answer: d. 125 J

Explanation:  Heat Q= mas x sp. hest x delta T = 25 (g) x 4.18 (J/g C) x 1.2 C

                                  = 125 J

Apr 19th, 2015

I have answered your question.

Niru

Apr 19th, 2015

thanks could you help me with this last problem please?

A lead mass is heated and placed in a foam cup calorimeter containing 50.0 mL of water at 18.0°C. The water reaches a temperature of 20.0°C. How much heat was released by the lead? (The specific heat capacity of water is 4.18 J/g•°C and the density of water is 1.00 g/mL)

108 J418 J376 J335 J

Apr 19th, 2015

Please put your  new question under $1 prepaid and I will answer.

Niru

Apr 19th, 2015

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