Balancing Equations
__HCl + __NaOH → __NaCl + __H2O
_1_HCl + _1_NaOH → _1_NaCl + _1_H2O
A solution is prepared by dissolving 0.25 moles of sodium chloride (NaCl) in enough water to make 0.500 L of solution.
0.50 M NaCl
A solution is made by dissolving 10.0 g of NaCl in 90.0 g of water. What is the mass percent (% m/m) of NaCl in the solution?
10.0% (m/m) NaCl
A sample of gas has a pressure of 725 mm Hg. What is the pressure in atm?
0.954 atm
Find the pH of a solution with a [H3O+] of 1.0 x 10-4 M.
4
__Fe + __Cl2 → __FeCl3
_2_Fe + _3_Cl2 → _2_FeCl3
How many moles of solute are in 15.0 g of potassium chloride (KCl), and what is the molarity if the solution volume is 0.250 L?
0.804 M KCl
A glucose solution is prepared by dissolving 25.0 g of glucose (C₆H₁₂O₆) in 75.0 g of water. Find the mass percent of glucose.
25.0% (m/m) glucose
A gas occupies 2.50 L at 1.00 atm. What will its volume be at 1.25 atm if temperature is constant?
2.00 L
Convert 37 °C to Kelvin.
310 K
__K + __B2o2 → __K2O + __B
_6_K + _1_B2o2 → _3_K2O + _2_B
How many grams of glucose (C₆H₁₂O₆) are needed to prepare 250. mL of a 0.400 M glucose solution?
18.0 g of glucose
What mass of NaOH is needed to make 150. g of a 12.0% (m/m) NaOH solution?
18.0 g NaOH
A gas has a volume of 450. mL at 20 °C. What is its volume at 60 °C (constant pressure)?
511 mL
How much heat is needed to raise 50.0 g of water from 25 °C to 80 °C?
c=4.184 J/g°C
0.5-1.8
__C7H16 + __O2 → __CO2 + __H2O
_1_C7H16 + _11_O2 → _7_CO2 + _8_H2O
A nurse needs to prepare 250. mL of 0.100 M NaOH from a 1.00 M NaOH stock solution. What volume (in mL) of the 1.00 M NaOH should be used?
25.0 mL of 1.00 M NaOH needed
A saline solution contains 8.0% (m/m) NaCl. If a nurse needs 200. g of solution, how many grams of water (solvent) are required?
184.0 g of water
A gas occupies 3.00 L at 750 mm Hg and 25 °C. Find its volume at 1.00 atm (760 mm Hg) and 0 °C (273 K).
2.69 L
Label each as endothermic (absorbs heat) or exothermic (releases heat):
a) Melting
b) Freezing
c) Evaporation
d) Condensation
a) Endothermic
b) Exothermic
c) Endothermic
d) Exothermic
__Na + __NaNO3 → __Na2O + __N2
_10_Na + _2_NaNO3 → _6_Na2O + _1_N2
Hydrochloric acid reacts with sodium bicarbonate according to the equation:
HCl (aq)+NaHCO₃ (aq)→NaCl (aq)+H₂O (l)+CO₂ (g)
If 25.0 mL of 0.200 M HCl reacts completely with NaHCO₃,
a) how many moles of NaHCO₃ react?
b) what mass of NaHCO₃ is required?
a) 0.00500 mol NaHCO₃
b) 0.420 g NaHCO₃
A solution is prepared by mixing 20.0 g of ethanol (C₂H₅OH) with 80.0 g of water. After some evaporation, 5.0 g of water is lost. What is the final mass percent of ethanol in the solution?
21.1% (m/m) ethanol
A gas mixture contains O₂ = 0.300 atm, N₂ = 0.550 atm, and CO₂ = 0.150 atm. Find the total pressure.
A gas mixture contains O₂ = 0.300 atm, N₂ = 0.550 atm, and CO₂ = 0.150 atm.
Find the total pressure.
How many molecules of carbon dioxide (CO₂) are in 0.250 moles of CO₂?
1.51 × 10²³ molecules of CO₂