General Chemistry Answers

1.     Does a Lewis structure tell which electrons come from which atoms? Explain.

How many oxygen atoms are present in 2.5 moles of acetic acid, CH3COOH?

If 80cm cube of methane (CH4)diffuses through a porous membrane in 20 seconds while 50cm cube of gas Q diffuse through the same membrane in 25 seconds.Calculate the molecular mass of gas Q

To what temperature must a given mass of nitrogen at 0^oC heated so that both its volume and pressure will be doubled?

how much heat does 23.0 g ice cube absorb as its temperature increases from "-17.40" C to 0.00? Assume the specific heat of ice is 2.03 J/g C is this endothermic or exothermic 

Convert the following concentrations of aqueous solutions.

1.) 35.0% HCI_(aq) m FW (HCI)=34.46 g/mol

2.) x_KF =0.102 m MW(H₂O)=18.02 g/mol

3.) 2.50 m KNO_3(aq) x_KNO3 MW(H₂O)=18.02 g/mol

4.) 1.17 M H₂ SO_A(aq) N H₂SO₄ used as an acid to form Na₂SO₄

5.) 1.73% Pb_(aq) ppm

6.) 956 ppm Cu_(aq) %(w/w)

7.) 1200 pbb Ca_(aq) ppm

8.) 7.97 ppm Mg_(aq) ppb

How many moles of water are made from 0.25 moles of glucose

how many formula units of iron (III) oxide can be produced from the reaction of 108 g of iron with 72.1 L of oxygen gas at STP?

Phosphorous pentachloride decomposes to phosphorus trichloride according to this equation:

PCl5(l) <===> PCl(g) + Cl2(g). At equilibrium, [PC5] = 1.00 M and [Cl2] = 3.16 x 10^-2 M. Show your work.

A. Write the expression for determining the concentration of PCl3.

B. What is the equilibrium concentration of PCl3? Use: Keq = 1.00 x 10^-3.

Calculate the standard heat of vaporization, △Hvap, for tin(IV) chloride, SnCl4.

△H°f = -511.3 kJ/mol for SnCl4(l) and -471.5 kJ/mol for SnCl4(g). Show your work.