Practice Pre-IB Chem Math Questions

What is the molarity of a solution that contains 0.202 KCL in 7.98L solution?

0.0253 M

A 4.0 g sample of iron was heated from 0ºC to 20.ºC. It absorbed 35.2 J of energy as heat. What is the specific heat of this piece of iron?

0.44 J(g·ºC)

What is the molarity of a solution that contains 125g NaCl in 4.00L solution? (molar mass of NaCl=58.44 g/mol)

0.535 M

For the reaction represented by the equation Pb(NO3)2 + 2KI >PbI2 + 2KNO3, how many moles of lead(II) iodide are produced from 300. g of potassium iodide and an excess of Pb(NO3)2?

0.904 mol

What is the molality of a solution that contains 5.10 KNO3 in 4.47kg water? (molar mass of KNO3=101.11 g/mol)

1.14 m

On a cold winter morning when the temperature is -13ºC, the air pressure in an automobile tire is 1.5 atm. If the volume does not change, what is the pressure after the tire has warmed to 15ºC?

1.7 atm

Neon-21 contains

10 protons

For the reaction represented by the equation 2H2 + O2 > 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?

108 g

Calculate the approximate volume of a 0.600 mol sample of gas at 15.0°C and a pressure of 1.10 atm.

12.9 L

For the reaction represented by the equation Cl2 + 2KBr > 2KCl + Br2, how many grams of potassium chloride can be produced from 300. g each of chlorine and potassium bromide?

188 g

Phosphorus-34 contains

19 neutrons

How many moles of ions are produced by the dissociation of 1 mol of MgCl2?

2 mol

How many moles of ions are produced by the dissociation of 1 mol of NH4Br?

2 mol

The volume of a sample of oxygen is 300.0 mL when the pressure is 1.00 atm and the temperature is 27.0ºC. At what temperature is the volume 1.00 L and the pressure 0.500 atm?

227ºC

A 1.00 L sample of a gas has a mass of 1.25 g at STP. What is the mass of 1.00 mol of this gas?

28.0 g

What is the pressure exerted by 1.2 mol of a gas with a temperature of 20.ºC and a volume of 9.5 L?

3.0 atm

An NaOH solution contains 1.90 mol of NaOH, and its concentration is 0.555 M. What is its volume? (molar mass of NaOH=40.00 g/mol)

3.42 L

For the reaction represented by the equation 2Na + 2H2O >2NaOH + H2, how many grams of hydrogen are produced if 120. g of sodium and 80. g of water are available?

4.5 g

The volume of a gas is 93 mL when the temperature is 91ºC. If the temperature is reduced to 0ºC without changing the pressure, what is the new volume of the gas?

70 mL

For the reaction represented by the equation 2Na + Cl2 > 2NaCl, how many grams of chlorine gas are required to react completely with 2.00 mol of sodium?

70.9 g

How much energy does a copper sample absorb as energy in the form of heat if its specific heat is 0.384 J/(g·ºC), its mass is 8.00 g, and it is heated from 10.0ºC to 40.0ºC?

92.2 J

What is the formula mass or molar mass of magnesium chloride, MgCl2?

95.21 amu

What is the formula for aluminum sulfate?

Al2(SO4)3

What is the formula for Copper (I) Oxide?

Cu2O

What is the formula for Iron (III) Nitrate?

Fe(NO3)3

The following molecules contain polar bonds. The only polar molecule is

NH3

Which particle is associated with beta decay?

electron

Use VSEPR theory to predict the shape of carbon dioxide, CO2.

linear

What element has the following electron configuration: 1s22s22p63s23p64s23d104p65s24d9?

silver

What is the energy required to raise the temperature of 1 g of a substance by 1ºC or 1 K?

specific heat