A42.6-mg sample of phosphorus reacts with sulfur to form 153 mg of the compound phosphorus sulfide. what is the empirical formula of phosphorus sulfide? express your answer as a chemical formula.

What are the percent by mass of copper in penny lab

What does the law of increasing costs say? a. as you make more and more of one good or service, you will also make more and more of another. b. as you make less and less of one good or service, you will also make less and less another. c. as you make more and more of one good or service, you will make less and less of another. d. there is no change in production levels when you shift from one good or service to another

Using this reversible reaction, answer the questions below: n2o4 2no2 (colorless) (reddish-brown) -as the temperature increased, what happened to the n2o4 concentration? -was the formation of reactants or products favored by the addition of heat? -which reaction is exothermic? right to left or left to right? -if the change of enthalpy of this reaction when proceeding left to right is 14 kcal, which chemical equation is correct? n2o4 2no2 + 14 kcal n2o4 2no2, hr = +14 kcal n2o4 + 14 kcal 2no2 n2o4 2no2, hr = -14 kcal