1. How many sig figs should the result of the following have? Xs are digits that are purposefully not given.
16.XX/(2.7 + 9.X)
2. A student performed four trials to determine the molar mass of butane in
a) 61 g/mol to 77 g/mol
b) 68.7 +/- 8.2 g/mol
c) 69 +/- 8 g/mol
d) 68.7 +/- 8 g/mol
3. Which of the following is NOT an acid? ( can be more than one choice)
a) HCl(aq)
b) H2CO3(aq)
c) HNO3(aq)
d) All are acids
e) CH3COOH
4. How many moles of NaOH are there in 22.5 mL of 0.97 mol/L NaOH solution? Keep 3 decimal places for your answer.
5. How many moles of NaOH are needed to neutralize 0.74 mol of H2SO4? Keep 2 decimal places for your answer.
6. At constant pressure, density of gas is inversely proportional to its temperature. This is how hot air balloon is floating in air: burning fuel makes inside air temperature higher and density lower; low density air balloon float on high density regular air. What is the density of air in g/L at 66 degree C if the atmospheric pressure is 1.0 atm? The average molar mass of air is about 29 g/mol. Keep two decimal places for your answer.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
