1. In the laboratory a student determines the specific heat of a metal as follow

Question

1. In the laboratory a student determines the specific heat of a metal as follows: She heats 19.3 grams of magnesium to 98.55 °C and then drops it into a cup containing 79.5 grams of water at 22.39 °C. When thermal equilibrium is reached, she measures the final temperature to be 26.48 °C.Assuming that all of the heat from the metal is transferred to the water, she calculates the specific heat of magnesium to be____ J/g°C.

2.How much energy is required to raise the temperature of 12.4 grams of gaseous neon from 22.1 °C to 38.9 °C ? ____ Joules

Explanation / Answer

Ans 1

Heat gained by water = heat released by magnesium

Mass of water x Cpw x (T-T1) = mass of Mg x Cpm x (T2-T)

79.5 g x 4.184 J/gC x (26.48 - 22.39)C = 19.3 g x Cpm x ( 98.55 - 26.48)C

1360.448 = 1390.951 x Cpm

Cpm = 0.978 J/gC

specific heat of magnesium = 0.978 J/g°C

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.