Chemical Quantities
What is the molar mass of water (H2O)?
18.02 g/mol
Balance this: __H2 + __O2 → __H2O
2H2 + O2 → 2H2O
What happens to pressure if volume gets smaller?
Pressure increases
Is ice melting endothermic or exothermic?
Endothermic
What's the pH of pure water?
Neutral solution
How many moles are in 36 grams of water?
2.00 mol
In 2H2 + O2 → 2H2O, how many water molecules made from 2 mol H2?
2 mol H2O
What happens to gas volume if temperature increases?
Volume increases
What sign is ΔH for a heat-releasing reaction?
Negative
What is the name of HCl?
Hydrochloric acid
How many molecules are in 1 mol of water?
6.022 × 1023 molecules
If you burn 44 g of propane (C3H8), how many grams of CO2 are made?
132 g CO2
A gas takes up 6 L at 1 atm. What is the volume at 2 atm?
3L
Heat 50 g water by 10°C (c = 4.18). How much heat?
2090 J
Is NH3 a base?
Yes
What is the percent of oxygen in H2O?
88.8%
What is the limiting reactant if 2 mol H2 reacts with 1 mol O2?
H2
Add O2 (0.5 atm) and N2 (0.8 atm). What’s total pressure?
1.3 atm
What does enthalpy mean?
Heat of a system
What is the pH of 0.001 M HCl?
3
What is the empirical formula of a compound with 1 mol of C, 2 mol of H, and 1 mol of O?
CH2O
If you expected 100 g of product but got 75 g, what is the % yield?
75%
What is the volume of 1 mol of gas at STP?
22.4 L
100 g water heats from 25°C to 35°C. How much energy?
100 g water heats from 25°C to 35°C. How much energy?
What’s the conjugate base of HCl?
Cl-