Chemistry Answers

140 g of S2Cl2 was collected from the reaction of 640 g of Sulfur and 142 g of Chlorine. How much of the excess reactant was left over?

Balance the redox reaction using the steps on the oxidation state method(10 pts)

HNO² + HI -> NO + I² + H²O

Determine the ΔS system given the reaction : 

       C6H12O6 (s) + O2(g) --------------→ CO2 (g) + H2O(l)

In that problem, is R a know value that never changes?

A gas occupies a volume of 31.0L at 17.0⁰C. If the gas temperature rises to 34.0⁰C at constant pressure, would you expect the volume to double to 2.0L?

A sample of a gas occupies 75.0mL at 0.400atm. If the temperature remains constant, a.)what volume would the gas occupy at 4.00atm? b.) How about 0.00400 atm? (Note: 1atm = 1.01325 x10⁵ Pa)

A 1.68 gram sample of CaCO₃ (100.09 g/mol) is placed in a 109 mL flask and dissolved in HCl, calculate the resulting molarity of the calcium ion.

What is the percentage composition of Na2SO4?

Suppose you have two containers, one containing a dilute acid and the

other a dilute base, but there are no labels on them. Describe how you

could use red cabbage to determine which solution is which.

How many grams of CuCl2·2H2O are needed to prepare 0.500 L of solution containing 0.250 M Cl-(aq)?