CHEM 1050 : Chem 1050 Equations Summary

54 views1 pages

lavenderdeer991

18 Nov 2014

School

Department

Course

Professor

For unlimited access to Study Guides, a Grade+ subscription is required.

Document Summary

Ek = mv2 (m is mass, v is speed or velocity) Ep = mgh (g constant accel. gravity = 9. 807m/s2, h is the height) U = q + w (q is heat, w is work) w = -p v. H = h(products) h(reactants) q = h (at fixed p and t) q = c t = n t = mcs t (heat capacity) (molar) (specific) qp = u + p v (constant pressure) H = u + nrt qv = u (constant volume) G = - rtlnk lnkeq = (- h/r)*(1/t) + ( s /r) or y = m x + b ln(k2/k1) = ( h /r)*((t2 t1)/ t1*t2) Mx(s) m+ (g) + x- (g) , hlattice. Spontaneous at low temp, nonspontaneous at high temp.

Related Questions

The heat energy associated with a change in temperature that does not involve a change in phase is given by

q=ms?T

where q is heat in joules, m is mass in grams, s is specific heat in joules per gram-degree Celsius, J/(g??C), and ?T is the temperature change in degrees Celsius. The heat energy associated with a change in phase at constant temperature is given by

q=m?H

where q is heat in joules, m is mass in grams, and ?H is the enthalpy in joules per gram.

Physical constants

The constants for H2O are shown here:

Specific heat of ice: sice=2.09 J/(g??C)

Specific heat of liquid water: swater=4.18 J/(g??C)

Enthalpy of fusion: ?Hfus=334 J/g

Enthalpy of vaporization: ?Hvap=2250 J/g

Part A

How much heat energy, in kilojoules, is required to convert 64.0 g of ice at ?18.0 ?C to water at 25.0 ?C ?

Express your answer numerically in kilojoules.

Submit

Part B

How long would it take for 1.50 mol of water at 100.0 ?C to be converted completely into steam if heat were added at a constant rate of 22.0 J/s ?

Express your answer numerically in minutes.

The heat energy associated with a change in temperature that does not involve a change in phase is given by

q=msÎT

where q is heat in joules, m is mass in grams, sis specific heat in joules per gram-degree Celsius, J/(gâ âC), and ÎT is the temperature change in degrees Celsius. The heat energy associated with a change in phase at constant temperature is given by

q=mÎH

where q is heat in joules, m is mass in grams, and ÎH is the enthalpy in joules per gram

The constants for H2O are shown here:

Specific heat of ice: sice=2.09 J/(gâ âC)

Specific heat of liquid water: swater=4.18 J/(gâ âC)

Enthalpy of fusion (H2O(s)âH2O(l)): ÎHfus=334 J/g

Enthalpy of vaporization (H2O(l)âH2O(g)): ÎHvap=2250 J/g

Part A

How much heat energy, in kilojoules, is required to convert 75.0 g of ice at â18.0 âCto water at 25.0 âC ?

Part B

How long would it take for 1.50 mol of water at 100.0 âC to be converted completely into steam if heat were added at a constant rate of 17.0 J/s ?

97. The kinetic energy of a rolling billiard ball is given by KE = 2 mv. Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial speed of 4.5 m/s. As it travels, it loses some of its energy as heat. The ball slows down to 3.8 m/s and then collides head-on with a second billiard ball of equal mass. The first billiard ball completely stops and the second one rolls away with a velocity of 3.8 m/s. Assume the first billiard ball is the system. Calculate w,q, and AE for the process.

CHEM 1050 : Chem 1050 Equations Summary

Document Summary

Get access

Related textbook solutions

Chemistry: Structure and Properties

Basic Chemistry

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Principles of Chemistry Molecular Approach

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related Documents

CHEM 1050 Study Guide - Midterm Guide: Lattice Energy, University Of Houston, Molar Mass

CHEM 1050 Study Guide - Midterm Guide: University Of Houston, Benzene, Sodium Hydroxide

CHEM 1050 Lecture Notes - Lecture 1: Chemical Equilibrium, Electrochemistry, Chemical Equation

Related Questions