Title: Using the Road Map for a Mass - Mass Problem
Course: Stoichiometry

Introductory Steps to Use the Road Map

The Steps:

1. Identify the given
2. Identify the unknown
3. Locate on the road map the starting point (the given)
4. Locate on the road map the ending point (the unknown)

Example Problem on Using the Road Map:

Given the following equation:

2 Na + 2 H_2O ==> 2 NaOH + H_2

How many grams of water does it take to react with 100.0 g of Na?

1. Identify the given:
·100.0 g of Na

2. Identify the unknown:
·g of water

3. Locate the starting point on the road map:
·The units of the given is "grams" (100.0 g of Na). Therefore, you would start at "Mass of A" on the road map.

4. Locate the ending point on the road map:
·The units of the unknown is "grams" (g of H_2O). In addition, water is a separate substance than Na. Therefore, you would end at "Mass of B" on the road map.