7 concentration

Calculate the minimum concentration of Cr^3+ that must be added to 0.095 mol/Litre NaF in order to initiate a precipitate of chromium(lll)flouride. (For CrFsubnumber3,Ksubletterssp=6.6x10^-11) show all work and steps, thanks

8 precipitate of magnesium flouride

Will a precipitate of magnesium flouride form when 200.0 milliliter of 1.9x10^-3mol/Litre MgClsubnumber2 solution is added to 300.0 milliliter of 1.4x10^-2mol/Litre NaFsolution? (ksubletterssp(MgFsubnumber2)=6.9x10^-9) Briefly explain by showing your numerical calculations show work. thanks

9 net ionic equation

Write a net ionic equation for the reaction occuring when a small amount of sodium hydroxide is added to a NaNOsubnumber2/HNOsubnumber2 buffer. show all work and steps, thanks

10 precipitate

Will a precipitate of AgCl form whrn 0.050 mol NaCl(s) and 0.050 mol AgN0subnumber3(s) are dissolved in 500.0 milliliter of 3.0 mol/Litre NHsubnumber3 solution? (Ksubletterf for Ag(NHsubnumber3)subnumber2^+ is 1.5x10^7 Ksubletterssp(AgCl)=1.6x10^-10) show all steps and work, thanks ...continues

12 solubility

The solubility of Ba(N0subnumber3)subnumber2 is 130.5 gram/Litre at 0 degrees C. Calculate Ksp for barium nitrate at 0 degrees C. show all work and steps, thanks

don't understand

What weight of C2H6 contains the same number of moles as 75.0g of CCl4?

don't understand

Explaining your answer, which of the following reactions is unlikely to occur? A. C2H4 + H2 C2H6 B. C2H2 + H2 C2H4 C. C2H6 + H2 C2H8

don't understand

2KClO3 2KCl + 3O2 How many grams of O2 are produced when 175.0g of the KClO3 react?

A simple stoichiometry problem

The heat of combustion of CH4 is -882kJ per mole. How much heat is produced when 100.0g of CH4 is combusted?

don't understand

Considering the reaction : 2H2(g) + O2(g) 2H2O(l). In this reaction, matter is less dispersed, leading to a decrease in entropy since the reactants are gases and the product is liquid. Nevertheless, the reaction is spontaneous. Explain why this is so.