Chemical Quantities
How many moles are in 18.0 grams of water (H₂O)?
0.999 moles (≈ 1.00 mol)
How many moles of water are produced when 4 moles of hydrogen gas react with excess oxygen gas?
4 moles of water are produced.
A gas occupies 4.00 L at a pressure of 1.00 atm. If the pressure increases to 2.00 atm (at constant temperature), what is the new volume?
2.00L
Is burning wood an endothermic or exothermic reaction?
Exothermic
Name H3PO4
Phosphoric acid
How many moles are in 3.01 × 10²³ molecules of CO₂?
0.500 mol
What volume of oxygen gas (at STP) is required to react with 22.4 g of methane (CH4CH_4CH4) completely?
62.6 liters.
A gas has a volume of 2.00 L at 300 K and 1.00 atm. What will its volume be at 400 K and 2.00 atm?
1.33L
Is photosynthesis an endothermic or exothermic reaction?
Endothermic
Name HNO3
Nitric Acid
What is the molar mass of calcium nitrate, Ca(NO₃)₂?
164.10 g/mol
How many grams of sodium chloride are produced from the reaction of 10.0 g of sodium with excess chlorine gas?
25.4
A gas has a volume of 3.0 L at a pressure of 1.5 atm. If the pressure increases to 3.0 atm (constant temperature), what is the new volume?
1.5
How much heat is required to raise the temperature of 50 g of water by 10°C? (specific heat of water = 4.18 J/g°C)
2090J
Name HBr
Hydrobromic Acid
How many molecules are in 22.0 grams of CO₂?
3.01 × 10²³ molecules
If 5.0 g of aluminum reacts with 10.0 g of chlorine gas, which reactant is limiting, and how many grams of aluminum chloride (AlCl3AlCl_3AlCl3) are produced?
Mass of aluminum chloride (AlCl₃) produced: 12.5 grams
A balloon filled with helium has a volume of 1.2 L at 270 K.What will the volume be if the temperature increases to 300 K (at constant pressure)?
1.33L
What does specific heat mean?
The amount of heat needed to raise the temperature of 1 gram of a substance by 1°C
Write the formula for Barium hydroxide
Ba(OH)2
A compound is 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?
CH₂O
If 10.0 g of calcium reacts with 10.0 g of water, how many grams of calcium hydroxide are formed, and how much of the excess reactant remains?
Mass of calcium hydroxide (Ca(OH)₂) formed: 18.47 g
Mass of excess water (H₂O) remaining: 1.03 g
If a gas is compressed from 6.0 L to 2.0 L and the initial pressure was 1.0 atm, what is the final pressure (at constant temperature)?
3 atm
What happens to the temperature of the surroundings during an endothermic reaction?
The temperature decreases
Write the formula for Beryllium hydroxide
Be(OH)2