Chem 115 Fun Stuff

Density

100

An object weighing 1.840g has a volume of 0.15m³. What is the density of the object?

12.266g/m³

200

A chef fills a 50 mL container with 43.5g of cooking oil. What is the density of the oil?

0.87g/mL

300

Calculate the volume of a liquid with a density of 5.45g/mL and a mass of 65g.

11.9266mL

400

A student measures the mass of an 8cm³ block of brown sugar to be 12.9g. What is the density of the brown sugar?

1.6125g/cm³

500

A pure silver coin weighs 8.062 grams. Determine the volume (in L) if the density of silver is 

1.049x10^-4kg/m³. 

(1L = 1.0x10^-3m³)

7.685 x 10^-4 L

Specific Heat

100

What is the specific heat capacity of water?

4.184J/g^oC

200

A 45g piece of metal absorbs 400J of heat energy, and its temperature changes from 10^oC to 50^oC. Calculate the specific heat of the metal.

0.222J/g^oC

300

100g of 1^oC water is heated until its temperature reaches 37^oC. If the specific heat of water is 4.184J/g^oC, calculate the amount of energy required to cause the rise in temperature.

15062.4J

400

How many Joules of heat are needed to raise the temperature of 15.0g of iron from 11.0^oC to 66.0^oC, if the specific heat of iron is 0.45J/g^oC?

371.25J

500

10g of ice-cubes at 0^oC is added to 100g of water at 30^oC. Specific heat capacity of water is 4.184J/g^oC and the specific latent heat of fusion of ice is 334J/g. What is the final temperature of water?

20.02^oC

Gas Conversions

100

How many moles of gas are contained in 890 L of gas at 21^oC and 3 atm of pressure?

111 moles

200

A 23.8 L balloon is filled with 88g CO₂ at 15^oC, what is the pressure in kPa?

201 kPa

300

1.09 g H₂ is contained in a 2.00 L container at 20.0^oC. What is the pressure in the container in mmHg?

4982 mmHg

400

A closed glass jar with an unknown volume is filled with 2.5 moles of neon gas at pressure of 200 mmHg. If the temperature is -100^oC, what is the volume of the gas?

135 L

500

If 235 mmHg of Ne, 852 mmHg of Ar and 121 mmHg of N₂ are combined, what is the total pressure in atm?

1.59 atm

Mass Percent

100

Calculate the percent composition of chlorine in calcium chloride.

63.88%

200

Calculate the percent composition of calcium in calcium phosphate.

38.76%

300

Calculate the percent of carbon in methane.

74.87%

400

Calculate the percent composition of phosphate in Adenosine triphosphate (C₁₀H₁₆N₅O₁₃P₃)

J.J. Thompson

500

Calculate the percent composition of phosphate in guanosine monophosphate (C₁₀H₁₄N₅O₈P)

26.15%

Random Questions

100

How many significant figures are in 152.320443

9 SF

200

Convert 1304mg to g

1.304 g

300

The empirical formula of a compound of phosphorus and oxygen is P₂O₅. The molar mass is 283.89g/mol. What is the molecular formula?

P₄O₁₀

400

A teacher performing a demonstration finds that a piece of cork displaces 23.5mL of water. The piece of cork has a mass of 5.7g. What is the density of the cork in g/L?

242.55 g/L

500

Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C₂H₅O₂

C₆H₁₅O₆