Reference no: EM132431825
1. Two molecules of one reactant combine with 3 molecules of another to produce 5 molecules of a product.
Which equation is the correct representation of the reaction?
- 2A+3B→5C
- 2A+5B→3C
- A2+B3→C3
- 3A2+B3→C5
2. A sample of nitrogen gas (N2)contains 3.0×10^24atoms of nitrogen.
About how many moles of nitrogen gas are in the sample?
3. Approximately how many particles are in a mole?
- 2.4×10^24
- 6.0×10^23
- 1.2×10^24
- 1.8×10^24
4. A chemical reaction yields 3 moles of lithium hydroxide (LiOH).
How many grams of lithium hydroxide are present?
5. What is the formula mass of calcium sulfate dihydrate [CaSO4·2H2O]?
Be sure to add the water of hydration, which is the 2H2O part (water surrounding the calcium sulfate).
- 136 g/mol
- 154 g/mol
- 164 g/mol
- 172 g/mol
6. In a spacecraft, this reaction occurs:CO2(g)+2LiOH(s)→LiCO3(s)+H2O(l)
How many liters of carbon dioxide will 4 moles of lithium hydroxide (LiOH) absorb? (One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.)
7. Which statement is true about 22.4 L each of hydrogen, ammonia, and uranium dioxide gas assuming that the temperature and pressure are the same for all the gases?
- The gases have the same number of molecules.
- Oxygen gas has the most number of molecules.
- Uranium dioxide gas has the most number of molecules.
- Hydrogen gas has the least number of molecules.