limiting reactants

Suppose 358 g aluminum sulfide react with 124 g water. Al2S3 + H2O -> Al(OH)3 + H2S unbalanced! What mass of the excess reactant remains?

reaction

Elemental sulfur occurs as octatomic molecules, S8. What mass of fluorine gas is needed for complete reaction with 218.48 g sulfur to form sulfur hexaflouride?

ions

Calculate the total number of ions in 14.6 g CaH2.

moles

Calculate the number of moles of Cl atoms in 0.873 g C2H4Cl2.

Stoichiometry

I have a couple of problems that I am struggling with. For the reaction 2NO+O2->2 NO2 what is the maximum amount (in g's) of NO2 which could be formed from 6.49g of NO and 18.8 g or O2? For the reaction 2CO+O2->2CO2 what is the maximum amount (in units of mol.) of CO2 which could be formed from 16.02g of CO and 1.16g of ...continues

Property of Oil

What property of oil makes it float on water?

significant figures

Need to calculate the average of the following two figures, and be sure to keep significant figures. 19.5 + 20.40 = 39.9 39.9 /2 = 19.95 If the answer is 19.95, what is the answer using significant figures only? Can the answer containing significant figures be put into scientific notation?

Vapor pressure

The vapor pressure of ethanol is 400 mmHg at 63.5 C. Its molar enthalpy of vaporization is 39.3 K Joule/mol. What is the vapor pressure of ethanol, in mmHg, at 34.9 C? Show work. For iodine, the molar enthalpy of sublimation is 62.3 k Joule/mol. The molar enthalpy of fusion is 15.3 k/Joule/mol. Calculate the molar enthal ...continues

Henry's Law constant in mol/litre atm

The solubility of nitrogen gas at 25 C and nitrogen pressure of 522 mmHg is 4.7 x 10^-4 mol/litre. What is the value of the Henry's Law constant in mom/Litre atm? Show work. Thanks for your time and help.

molarity

The density of a 20.3 Molar CH3OH (methanol) solution is 0.858 gram/ml. What is the molality of this solution? H20 is the solvent. Show work and thanks for your help and time.