Other Chemistry Answers

A 35L tank of oxygen is at 315K with an initial pressure of 190 atm. How many moles of gas does the tank contain?

A student was supplied with a bottle containing a mixture of A B C and D during a chemistry practical class . If A is a chemical which vaporizes when heated, Bus a soluble in water C has a magnetic properties and D is in soluble without any magnetic property. Show in an outline form how he would seperate this mixture.

a solution has 10 moles of alcohol and 10 moles of water. what is the composition of the solution expressed in mole fraction? 

my teachers answer is:

Mole fraction of alcohol = 0.033

Mole fraction of H2O = 0.967

Which one of the following compounds is the most soluble in water at 25 °C?

•  A. BaCO₃
•  B. KF
•  C. MgF₂
•  D. AgCl
•  E. SrSO₄

An ionic compound A₂B dissociates in water according to the equation

A₂B(s) ⇌ 2A⁺(aq) + B^2–(aq)

If the concentration of B^2– ions in a saturated solution of A₂B is 3.2 × 10^–3 M, then what is the solubility product constant (K_sp) of this compound?

•  A. 8.2 × 10^–7
•  B. 3.3 × 10^–8
•  C. 1.3 × 10^–7
•  D. 5.6 × 10^–7
•  E. 2.2 × 10^–7

What is the maximum possible concentration of Ba²⁺ ions in a NaOH solution if the concentration of OH^– is maintained at 0.100 M? The solubility product constant of Ba(OH)₂ is K_sp = 5.0 × 10^–3.

•  A. 0.32 M
•  B. 0.020 M
•  C. 0.50 M
•  D. 0.080 M
•  E. 0.125 M

500 mL of 0.0100 M CaCl₂ is mixed with 500 mL of 0.0100 M Na₂SO₄. How many grams of CaSO₄ will precipitate when the equilibrium is reached? The solubility product constant of CaSO₄ is K_sp = 2.50 × 10-⁵. MM(CaSO₄) = 136.14 g mol^–1.

•  A. 1.36 g
•  B. 2.04 g
•  C. No precipitate will form
•  D. 0.68 g
•  E. 5.45 g

A container with a closed pinhole contains 1 mol of H₂(g) and 1 mol of He(g). When the pinhole is opened, H₂(g) starts to effuse at a rate of 0.48 mol/h. What is the rate of effusion of He(g) at that moment?

•  A. 1.21 mol/h
•  B. 0.34 mol/h
•  C. 0.68 mol/h
•  D. 0.24 mol/h
•  E. 0.95 mol/h

A piece of metal was found to have 90% purity of iron Fe . An excess of Hcl was added to it . What would be the mass of the piece metal if the volume of H2 produced from this reaction was 14.4 L . Given : Vm=24l.mol

Why does not the presence of a catalyst influence a chemical equilibrium?