WHITE BOARD REVIEW CHEMISTRY

Question What’s the final temperature of 56 g of water at 21°C that releases 500 J? 18.87°C

Question How many Calories are in 70 kJ? 16.73 Cal

Question A 45 g metal at 98°C is dropped into 64 g of water at 23°C. The final temperature of the system is 54°C. What’s the specific heat of the metal? 4.19 J/g°C

Question Using: 4NH3 + 5O2  4NO + 6H2O, determine how many grams of H2O are formed from 200 grams NH3? 317.25 g H2O

Question How many mL of water are added to 100 mL of a 3.5 M solution to create a 1.5 M solution? 133.33 mL

Question How many grams of NaCl are dissolved to make 0.5 L of a 3.0 M solution? 87.825 grams NaCl

Question What’s the concentration in ppm, when 56 g of KBr dissolve to make a 3500 g solution? 16,000 ppm

Question How many kPa are in 782 mmHg? 104.23 kPa

Question Using: 4NH3 + 5O2  4NO + 6H2O, determine how many grams of H2O are formed from 10 mole O2? 216.24 g H2O

Question How many mL of a 5.0 M solution are needed to make 40 mL of a 3.5 M solution? 28 mL

Question What’s the percent of oxygen in CaCO3? 48%

Question How many formula units are in 4 g AlCl3? 1.81 x 1022 formula units AlCl3

Question What’s the atomic mass of Fe? 55.85 g

Question How many grams of solute are in 4500 g of a 40,000 ppm solution? 180 g

Question A 3.0 M of a 320 mL solution is diluted to 500 mL. What’s the new concentration of the solution? 1.92 M

Question How many formula units are in 4 mol AlCl3? 2.4 x 1024 formula units AlCl3

Question How many Joules are in 400 calories? 1,673.6 J

Question What’s the percent of Calcium in CaCO3? 40%

Question How many Calories are in 300 calories? 0.30 Cal

Question Using: 4NH3 + 5O2  4NO + 6H2O, determine how many moles of NO are formed from 15 mole O2? 12 mol NO

Question How many grams of water release 400 J of energy when cooling from 45°C to 32°C? 7.35 g

Question How many Joules are in 160 Calories? 669,440 J

Question How many grams are in 4 mol AlCl3? 533.32 g AlCl3

Question How much energy is released when 40 g of water cools from 87°C to 23°C? -10,711.04 J

Question Using: 4NH3 + 5O2  4NO + 6H2O, determine how many moles of H2O are formed from 100 grams O2? 3.75 mol H2O

Question How many psi are in 1.45 atm? 21.32 psi

Question What’s the specific heat of an unknown metal with a mass of 4.25 g that absorbs 200 J of energy going from 53°C to 79°C? 1.81 J/g°C

Question How much energy is absorbed when 20 g of water heats from 17°C to 53°C? 3,012.48 J

Question What’s the molarity when 0.96 moles of solute are dissolved to make 4.8 L solution? 0.2 M

Question What’s the molar mass of (NH4)2SO4? 132.17 g

Question How many moles were dissolved to make 4.0 L of a 3.4 M solution? 13.60 moles

Question How many mmHg are in 15.8 psi? 816.87 mmHg