2. Many calculations in chemistry will involve certain symbols, such as the symbol triangle or delta What does this symbol stand for or mean?
A. "The total"
B. "The change in"
C. "The unit"
D. "The formula"

An aqueous solution of hydroiodic acid is standardized by titration with a 0.186 m solution of calcium hydroxide. if 26.5 ml of base are required to neutralize 20.3 ml of the acid, what is the molarity of the hydroiodic acid solution? m hydroiodic acid

This is a mixture that has the same composition throughout.

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)