# mol

1. ### How to find H in kJ in complete combustion of 1 mol of butane?

Hi guys! Please help, my exam is coming up and I am so confused by this question. Question: Butane has H of -2871 kJ/mol when it undergoes complete combustion into carbon dioxide and liquid water. Given the following Hf values: *Carbon dioxide: -393.5kj/mol *Oxygen gas: 0 kj/mol *Liquid...
2. ### finding composition in mol %, anyone?

Copper can have improved wear resistance if alloyed with ceramic alumina, Al2O3. If a copper alloy has 8.5 wt.% Al2O3, What is its composition in mol %?
3. ### Common Ion Effect

What mass of Mg(OH)2 will dissolve in 1.0 L of 0.050 mol/L solution of MgSo4(aq)? Here is my work I just want to know if my calculations are correct. Mg(OH)2 <--> Mg^2+ + 2(OH-) Ksp= [Mg^2+][OH-]^2 = 5.6X10^-12 ICE Molar Solubility | [Mg^2+] | [OH-]^2 Initial...
4. ### 25cm3 of 0.15 mol dm3 sodium hydroxide reacts with 20cm3 of nitric acid

25cm3 of 0.15 mol dm3 sodium hydroxide reacts with 20cm3 of nitric acid NaOH + HNO3 ----- NaNO3 + H20 a/ Calculate the number of moles of NaOH in 25cm3 b/ What is the number of moles of nitric acid in 20cm3 c/ Calculate the molar concentration of nitric acid I think I have worked them...