Question

# Specific Heat The heat capacity of an object indicates how much energy that object can absorb...

Specific Heat

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 two objects of different temperatures come into contact with one another, the warmer object will cool and the cooler object will warm up until the system is at a single equilibrium temperature.

Note the difference between the terms molar heat capacity, which has units of J/(mol⋅∘C), and specific heat, which has units of J/(g⋅∘C).

In this problem answers are requested to three significant digits for grading purposes. The true number of significant digits may be more or less.

Part A

A volume of 120. mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘Cis placed in the water. If the final temperature of the system is 21.20  ∘C , what is the mass of the steel bar?

Use the following values:

specific heat of water = 4.18 J/(g⋅∘C)

specific heat of steel = 0.452 J/(g⋅∘C)

Express your answer to three significant figures and include the appropriate units.

mass of the steel =

SubmitHintsMy AnswersGive UpReview 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 water =

75.24Jmol°C

SubmitHintsMy AnswersGive UpReview Part

Incorrect; Try Again; 5 attempts remaining

A)

Density of water = 1.00 g/mL

Density = mass/volume

1.00 = mass/120

mass = 120 g

m1Cp1T1 = m2Cp2T2

where 1 represents water and 2 represents steel rod

120 4.18 (22.0 - 21.20) = m2 0.452 (21.20 - 2.00)

m2 = 46.2 g

B)

Mol mass of water = 18 g/mol
18 g/mol x 4.18 J/g.°C = 75.24 J/mol.oC (or K).

#### Earn Coins

Coins can be redeemed for fabulous gifts.

##### Need Online Homework Help?

Most questions answered within 1 hours.

##### Active Questions
• What is the Cost of Equity? Provide a definition, and suggest least one way that we...
asked 6 minutes ago
• The scores of fourth grade students on a mathematics achievement test follow a normal distribution with...
asked 13 minutes ago
• The chief cost accountant for Kenner Beverage Co. estimated that total factory overhead cost for the...
asked 20 minutes ago
• Activites involve for tunnel boring machine activites involve for tunnel boring machine for pune metro coasting...
asked 20 minutes ago
• Q5: a. Whenever you look at an element undergoing fluorescence, why do you see multiple colors...
asked 24 minutes ago
• a. *Find all solutions to the equation cos(5x – 3) = ½ . b. *The position,...
asked 25 minutes ago
• A particle of mass m is in the first excited state (i.e., n = 2) of...
asked 41 minutes ago
• Kevin and Bob have owned and operated SOA as a C corporation for a number of...
asked 46 minutes ago
• Suppose you observe the following effective annual zero-coupon bond yields: 5.08% (1-year), 4.55% (2-year), 3.97% (3-year)....
asked 49 minutes ago
• The following data are for 30 observations involving two categorical variables, x and y. The categories...
asked 53 minutes ago
• Researchers at Ohio State and Michigan put leader behavior into two broad categories; __________ and __________....
asked 57 minutes ago
• Create a class named MyTriangle that contains the following three methods: public static boolean isValid(double sidea,...
asked 1 hour ago