Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0280 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate? Solubility-product constants, Ksp, can be found here.

Ksp Ag_2SO_4 = 1.20e-5
Ksp CaSO_4 = 4.93e-5
What percentage of the Ca2 (aq) can be precipitated from the Ag (aq) by selective precipitation?

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock