Search & Filtering
A cylinder was found in a storeroom of a manufacturing plant. The label on the cylinder was gone, and no one remembered what the cylinder held. A 0.00469-gram sample was found to occupy 4.13 mL at 23° C and 745 torr. The sample was also found to be composed of only carbon and hydrogen. Identify the gas (C2H2, CH4. C2H6 or C2H4)
carry out each of the following conversions: (a) 25.5 m to km, (b) 36.3 km to m, (c) 487 kg to g, (d) 1.32L to mL, (e) 55.9 dL to L, (f) 6251 L to cm3
2. In determining the mole ratio which of the following will you consider?
A. The subscript of the product
B. The subscript of the reactant
C. The coefficient of balance reactant only
D. The coefficient of balance chemical equation
3. Base on the experiment which is your limiting reactant?
A. Carbon dioxide C. Vinegar
B. Sodium bicarbonate D. Water
4. During the experiment, what kind of gas form was produced?
A. Nitrogen C. Oxygen
B. Carbon dioxide D. Carbon monoxide
5. If both reactants have the same measurement, which statement is correct?
A. There is a limiting reactant in the reaction.
B. Only excess reactant will exist in the reaction.
C. Both limiting and excess reactant can be calculated.
D. There is no excess and limiting reactant in the reaction.
II. Calculation
Sodium chloride can be prepared by the reaction of sodium metal with chlorine gas
Suppose that 6.70 mol Na reacts with 3.20 mol Cl2
Write the balance chemical equation _________________________________
What is the limiting reagent? _____________________________
How many moles of NaCl are produced?
A mixture of methane (CH4), hydrogen (H2) and nitrogen (N2) with a volume of 100 ml,
burned completely with 120 ml of O2 gas (excessive). Combustion gas is flowed
through a tube containing CaCl2 so that all the water vapor will be absorbed. Gas coming out of
The volume of the CaCl2 tube is 75 ml. This gas mixture is flowed through a KOH solution where
CO2 gas will be absorbed. The gas that comes out of this KOH solution has a volume of 40 ml. All
gases are measured at the same temperature and pressure. What is the volume composition of the gas mixture?
at first
2. Why does the volume Of a gas decrease as the pressure is increase at constant temperature ?
2. Why does the volume Of a gas decrease as the pressure is increase at constant temperature ?
A reaction vessel contains 0.0200 M N2, 0.0600 M H2, and 0.0100 M NH3. With the aid of calculations, predict whether ammonia, NH3, will be formed or dissociate when the mixture goes to equilibrium at 400°C. Kc for the reaction is 0.500 at 400°C. Reaction: N2 (g) + 3H2 (g) 2NH3 (g)
What is the solubility of calcite (CaCO3) in grams per milliliter at a temperature at which its Ksp is 9.89×10-9?
What is the pH of a saturated solution of silver hydroxide, given Ksp = 1.53×10-8?
