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Based on Gultberg and Wagge's law for the speed of chemical reactions at constant temperatures, when the NO2 concentration increases while the CO concentration is kept constant in the reaction CO (g) + NO2 (g) -> CO2 (g) + NO (g) reaction speed?
In which of the following series do the two metals in their respective oxides have a valence of one (I)? A) CuO and PbO B) Cu20 and CuO C) Cu2O and K2O D) PbO and K2O
To prepare 100 cm3 of NaCl solution with a concentration of 2 mol/dm3 Ar(Na)=23; Ar(Cl)=35.5 are needed?
water?
5. Lead is a poisonous metal that especially affects children because they retain a
larger fraction of lead than adults do. Lead levels of 0.250ppm in a child cause delayed
cognitive development. How many moles of lead present in 1.00g of child’s blood
would 0.250ppm represent.
6. Acetone, C3H6, is the main ingredient of nail polish remover. A solution is made up
by adding 35.0mL of acetone (d=0.790g/mL) to 50.0mL of ethyl alcohol, C2H6O
(d=0.789g/mL). Assuming volumes are additive, calculate (a) the mass percent of
acetone in the solution. (b) the volume percent of ethyl alcohol in the solution. (c) the
mole fraction of acetone in the solution.
NaClO (sodium hypochlorite) in 3.8 liters of H2O (water)?
2. Compute for the molality of her disinfectant if she dissolved 5Tbsp. of NaClO
(sodium hypochlorite) in 3.8 liters of H2O (water).
3. Calculate the percent by mass of sodium hypochorite in her disinfectant solution. (
5Tbsp. of NaClO (sodium hypochlorite) and 3.8 liters of H2O (water). In units of grams
for both of the solute and solvent.
4. Calculate the mole fraction of sodium hypochorite and water in Aki’s solution. (
5Tbsp. of NaClO (sodium hypochlorite) and 3.8 liters of H2O (water).
5. Calculate the percent by volume of the disinfectant Aki made. Units in mL.
6. What is the concentration of her solution in parts per million? ( 5Tbsp. of NaClO
(sodium hypochlorite) and 3.8 liters of H2O (water)
The number of questions required to achieve mastery is?
II. EXERCISE: Directions: Solve the problems and show your complete solution.
1. What volume of 23% m/v solution contains 453 g of solute?
2. Find the amount of solute to make 0.5 L of a 39% m/v solution.
Directions: Solve the following problem and show your complete solution.
1. A 33 g of sucrose solution is dissolved 350 g of teacup of 80⁰C water. Find the % m/v of solution. Assume that the density of solution is 1.12 g/mL.
2. An aqueous solution of potassium bromide contains 176 g of KBr and 450 g of H20. What is the percent by mass/volume of KBr solution? density of KBr solution is 1.3746 g/mL
Directions: Solve the following problem and show your complete solution.
1. A cane sugar solution in water is 16 % by mass(m/m). Find the mass of sugar present in 0.118 kg of solution.
2. What mass of 41% m/m solution contains 0.084 kg of solute
3. What is the % by volume (v/v) of solution if 7.5 L HCl is added to 1900 mL of water?
4. How many mL of alcohol are present in 0.550 L of 45 proof of red wine?
What is the concentration of stock HNO3 which has density 1.50gcm-3 and has purity of 70%
