PT 3 - Calorimetry

The units of heat capacity are ________.

•  $\frac{K}{J}$  or  $\frac{\degree C}{J}$  

•  $\frac{J}{K}$  or  $\frac{J}{\degree C}$  

•  $\frac{J}{g-K}$  or  $\frac{J}{g-\degree C}$  

•  $\frac{J}{mol}$  

•  $\frac{g-K}{J}$   or  $\frac{g-\degree C}{J}$  

The units of specific heat (specific heat capacity) are ______.

• $\frac{K}{J}$ or $\frac{\degree C}{J}$

• $\frac{J}{K}$ or $\frac{J}{\degree C}$

• $\frac{J}{g-K}$ or $\frac{J}{g-\degree C}$

• $\frac{J}{mol}$

• $\frac{g-K}{J}$ or $\frac{g-\degree C}{J}$

The molar heat capacity of an unknown substance is 92.1  $\frac{J}{mol-K}$  . If the unknown has a molar mass of 118  $\frac{g}{mol}$  , what is the specific heat capacity  $\left(\frac{J}{g-K}\right)$  of this substance?

• 1.28

• -92.1

•  $1.09\times10^4$  

• 0.781

• 92.1

Tags

NGSS.HS-PS3-4

The specific heat capacity of lead is 0.13  $\frac{J}{g-K}$  . How much heat (in  $J$  )is required to raise the temperature of 15 g of lead from 22 $\degree C$   to 37 $\degree C$  ?

• 2.0

• -0.13

•  $5.8\times10^{-4}$  

• 29

• 0.13

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

What is the molar heat capacity  $\left(\frac{J}{mol-K}\right)$  of liquid bromine? The specific heat of liquid bromine is 0.226  $\frac{J}{g-K}$  .

• 36.1

• 707

• 18.1

• 9.05

• 0.226

The specific heat of liquid bromine is 0.226  $\frac{J}{g-K}$  . How much heat (in Joules) is required to raise the temperature of 10.0 ml of bromine from 25.00 $\degree C$   to 27.30 $\degree C$ ? The density of liquid bromine is 3.12  $\frac{g}{ml}$  .

• 5.20

• 16.2

• 300

• 32.4

• 10.4

Tags

NGSS.HS-PS3-4

The combustion of titanium with oxygen produces titanium dioxide

 $Ti_{\left(s\right)}+O_{2\ \left(g\right)}\ \rightarrow\ TiO_{2\ \left(s\right)}$  

When 0.610 g of titanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00  $\degree C$   to 50.50  $\degree C$ . In a separate experiment, the heat capacity of the calorimeter is measured to be 9.84 kJ/K. The heat of reaction for the combustion of a mole of Ti in this calorimeter is ________ kJ/mol.

• 2.09

• 4.14

• -311

• -0.154

•  $-1.98\ \times10^4$  

A sample of aluminum metal absorbs 11.2 J of heat, upon which the temperature of the sample increases from 23.2  $\degree C$  to 30.5  $\degree C$ . Since the specific heat capacity of aluminum 0.90  $\frac{J}{g-K}$  , the mass of the sample is _______ grams.

• 72

• 1.7

• 10

• 65

• 7.3

A sample of calcium carbonate  $\left(CaCO_{3\ \left(s\right)}\right)$  absorbs 40.3 J of heat, upon which the temperature of the sample increases from 20.8  $\degree C$   to 27.3  $\degree C$ . If the specific heat of calcium carbonate is 0.82  $\frac{J}{g-K}$   , what is the mass (in grams) of the sample?

• 7.6

• 5.1

• 6.7

• 0.13

• 5.3

Tags

NGSS.HS-PS3-4

What is the final temperature of a 35.1 g sample of iron, having an initial temperature of 24.5  $\degree C$ , when it absorbs 115 J of heat? The specific heat capacity of iron is 0.450  $\frac{J}{g-K}$ .

• 26.3

• 27.9

• 38.6

• 31.8

• 34.9