Question

Specific Heat 4 of 29 > Review Constants Periodic Table Part A The heat capacity of an object indicates how much energy that object can absorb for a given increase in that object's temperature. In a system in which toobjects of different temperatures come into contact with one another the warmer object will cool and the cooler object w a rm up until the system is at a single equilibrium temperature. Note the difforence between the terms molar heat capacity, which has units of J/mol C. and specific heat, which has units of J/g. C. 95.0 mL of II,O is initially at room temperature (22.0°C). A chilled steel rod at 2.0°C is placed in the water. If the final temperature of the system is 21.4°C what is thems of the star? Specific heat of water 4.18 J/g. C C Specific heat of steel -0.452 J/B Express your answer numerically, in grams, to one significant figure View Available Hints) . AZ OM? mass of the steel Submit Previous Answers Part B The specific heat of water is 4 18 J/g °C. Calculate the molar heal capacity of water. Express your answer numerically in joules per mole Celsius, to three significant figures. View Available Hints) 96 ASO O ? molar heat capacity for water = J/molc Submit Provide Feedback Next >

Answer 1

Answer

Paun Assuming no heat loss to the surroundings, heet loss by water - heat gained by steel and mass of water density & vowme - 1 g / me x 95.0 me = 951 head lost by crater & - - m C AT B =-959 x 4. 18 J/g.c (21.40-22) ve sign for heat lost) 5-1957) x[4.18 Ilg'al (-0.60 octer & - - MG AT = 238.26 Heal gined by steel rod = m CAT - mx 0.4503/91c (21.40-2') 119.4°C) = mx 10.452 Colg'o Equeting 238.26 ① to we get = 8. 19/g x m J 238.26 ] - man 27 +386 g = mass of steel bar

fart B Speufic heat of water - 4.18 J/g. c o no of grams in 1 mol of water = 18.015 g ma molar heat capacity - Specfic heat of water x we moler mass of water 18.01s gmolt 4.18 Ilg'c X - 15.30 J/moloc