1. WHITE BOARD REVIEW
CHEMISTRY

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

3. Question
How many Calories are in 70 kJ?
16.73 Cal

4. 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

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

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

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

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

9. Question
How many kPa are in 782 mmHg?
kPa

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

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

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

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

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

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

16. 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

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

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

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

20. Question
How many Calories are in 300 calories?
0.30 Cal

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

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

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

24. Question
How many grams are in 4 mol AlCl3?
g AlCl3

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

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

27. Question
How many psi are in 1.45 atm?
21.32 psi

28. 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

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

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

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

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

33. Question
How many mmHg are in 15.8 psi?
mmHg