Question #70c66
1 Answer
Oct 6, 2017
0.00021749
Explanation:
Whenever I need to find the number of moles of a substance, I always use the triangle:
Source, www.imgarcade.com, 2017
Through this triangle we can find:
- Mass (no. of moles x molar mass of substance)
- Molar Mass (mass (g) ÷ no. of moles)
- Moles (mass (g) ÷ molar mass of substance)
NOTE: Before finding the number of moles in 5mg of Sodium, we must convert 5 milligrams to grams.
-
5mg = 0.005g
-
#mol_(Na)# =#0.005/22.99# = 0.00021749mol