e Masteringchemistry Assig Y Chemistry mass calculation... Search session master

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e Masteringchemistry Assig Y Chemistry mass calculation... Search session masteringchemistry.com myct/it 76039443 Online 8 Week Chem 1411 Spring 2017 Help I Close Assignment 26 Chap 5: Specific Hea Specific Heat Resources e previous I 1 of 3 I next Specific Heat Part A A volume of 125 mL of H2O is initially at room temperature (22.00 C), Achilled steel rod at 2.00 Cis placed in the water. If the final temperature of the system is 21.10 oC,what is the mass of the steel bar? The heat capacity of an object indicates how much energy that object can absorb for a given increase in that Use the following values: object's temperature. In a system in which two objects of specific heat of water 4.18 J/(g.°C) different temperatures come into contact with one another, the warmer object will cool and the cooler object specific heat of steel 0.452 J/(g C) will warm up until the system is at a single equilibrium temperature. Express your answer to three significant figures and include the appropriate units. Note the difference between the terms molar heat capacity, which has units of J/(mo C), and specific heat, which has units of J/(g. C). mass of the steel Value Units Submit Hints My Answers Give Up Review Part Part B The specific heat of water is 4.18 J/(g. C). Calculate the molar heat capacity of water. Express your answer to three significant figures and include the appropriate units. molar heat capacity for wate Value Units Subm Hints My Answers Give Up Review Part

Explanation / Answer

A)

density of water is 1 g/mL.

So, mass of water = volume of water = 125 g

use:

heat lost by water = heat gained by rod

m(water)*c(water)*delta T(water) = m(rod)*c(rod)*delta T(rod)

125*4.18*(22-21.10) = m*0.452*(21.1-2.00)

418 = m*8.6332

m = 48.4 g

Answer: 48.4 g

B)

specific heat is 4.18 J/g.oC

molar mass of H2O = 18 g/mol

molar heat capacity = specific heat * molar mass

= 4.18 J/g.oC * 18 g/mol

= 75.2 J/mol.oC

Answer: 75.2 J/mol.oC

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