The ΔE of a system that releases 12.4 J of heat and does 4.2 J of work on the surroundings is ________ J.

A washer has an inner radius of 0.27 in. and an outer radius of 0.84 in. Find the area of thewasher (the shaded area) rounded to the nearest thousandth.

Perform the indicated operation by hand.If a tank has 15.469L of fuel and 14.548L are removed, how much remains? (L denotes liters)

Find the product. a)    (-46)(-4)(0)(-17)(-3)   a)      (-4)(-4)(6)(-2)

Convert to the indicated form.a)     15.9% to decimal form b)    0.0078 to percentage form

Given the following reactions2S (s) + 3O2 (g) → 2SO3 (g) ΔH = -790 kJ S (s) + O2 (g) → SO2(g)ΔH = -297 kJ the enthalpy of the reaction in which sulfur dioxide is oxidized to sulfur trioxide 2SO2 (g) + O2 (g) → 2SO3 (g)is ________ kJ.

Find the absolute value.a)   

Perform the indicated operation. a)   

Evaluate the expression (to the nearest hundredth if necessary). a)   

Place the following in order of decreasing first ionization energy, IE1.CsMgAr