Inorganic Chemistry Answers

What is the concentration, in g/mL, of a solution made by dissolving 75.0 g of phosphoric acid in 50.0 mL of solution?

What is the molar concentration of a solution containing 10.0 g of NaOH in 250 mL of solution?

Which one reduces CuSO4
1) KCN. 2) KF. 3) NH3. 4) HNO3

Which one reduce CuSO4
1) KCN. 2) KF. 3) NH3. 4) HNO3

why aluminuim is used in flashlight photography?

Dry air is a mixture, by volume, of 78% nitrogen (N2), 21% Oxygen (O2) and Argon (Ar 40 g).
a) Compute the gram molecular weight of dry air
b) Assuming water vapor saturation the new mixture being at 20 deg.Celius contains 2.4% water vapor by volume. Compute the new gram molecular weight of the mixture
c) In this last case compute the percentage of Oxygen, by weight, of the mixture

Question
Historically chlorine gaz, cl2 has been used do disinfect drinking and swimming pool waters. Knowing that chlorine gas reacts in water according to the following reaction:
CL2+H2O=HOCL+H+CL
and that the manufacturer of bleach water certifies that in 100 g of their product there are 10.8 g of NaCl (the other 89.2 g filling material with no relation at all with disinfection), that HOCl is a weak acid that dissociates as follows:
HOCl = H + OCl , pK= 7.54
Show that the 10.8 g of NaOCl is equivalent to 10.3 g of Cl2

Calculate the % yield from an experiment that produced 5.85 grams of Nitrogen gas from the combustion of 66.92 grams of CH3NH2 with 79.8 grams of O2 at 273°K and 1 ATM CH3NH2(g) + O2(g) → CO2 + N2 + H2O.

N2 and O2 are converted to monocations N2+ and O2+ respectively.which is wrong
1) in N2+,the N-N bond weakens
2) in O2+ the O-O bond order weakens
3) in O2+, the paramagnetism decreased
4) N2 become diamagnetic