Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2Fe(s) + 3Cl2(g)2FeCl3(s)
kJ

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Acompound has a molar mass of 92.02 grams/mole, and its percent composition is 30.4% nitrogen (n) and 69.6% oxygen (o). what is its molecular formula? a. n2o4 b. no2 c. n2o d. n4o2

Displacement is the slope of a velocity vs. time graph a. true b. false