A) Ammonia and nitrogen monoxide react together according to the following
equation:
4NH3(g) + 6NO (9) - 5N2 (9) + 6H20 (g)
50.0 dm3 of ammonia is reacted with 50.0 dm3 of nitrogen monoxide at 150.0 °C and
100 kPa. Identify the excess reagent and determine the volume of nitrogen produced.
(2)
b)
Determine the volume of excess gas and hence total volume of gas after the reaction
has finished.
(1)
c)
What mass of nitrogen is produced in the reaction? Express your answer to an
appropriate number of significant figures.
(2)

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.

Astudent states that 9.0 g of baking soda will form an unsaturated solution in 100 g of water. what do you need to know to decide whether this statement is correct? a. the temperature of the water and the molar mass of baking soda b. the percent by volume of the solution and the solubility of baking soda c. the temperature of the water and the solubility of baking soda at that temperature