Calculate the mass of Na2O needed to release 105 kJ of heat energy according to the following reaction: Na2O (s) + 2HI (g) → 2NaI (s) + H2O (l) ΔH = -502 kJ

13.0 g
155 g
97.4 g
24.8 g

Write a hypothesis that answers the lesson question, “while observing a chemical reaction, how can you tell which reactant is limiting? ” hypothesis: if a substance is the limiting reactant, then . . because . .

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution