Karen  measures the initial volume of water as 12.5 mL.  She then adds a 2.3 gram rubber stopper and the volume rises to 20.8 mL. What is the volume of Karen's rubber stopper?

a18.5 grams
b 2.3 grams
c 20.8 ml
d 8.3 ml

Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon

Exit what is the density of an object having a mass of 5.0 g and a volume of 45.0 cm3?

Can someone me out on this question for my national 5 chemistry homework