5: Chemical Reactions
- Page ID
- 291349
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- 5.25: Mole Ratios
- You want to add some sections to the porch. Before you go to the hardware store to buy lumber, you need to determine the unit composition (the material between two large uprights). You count how many posts, how many boards, how many rails - then you decide how many sections you want to add before you calculate the amount of building material needed for your porch expansion.