Question

Using dimensional analysis, make the following conversions. Show all steps

a)1.0 m^3 to ml
b)1.0 nm to km

Give an example of an entity that is an atom, a formula unit and a molecule. Use examples

Using nitrogen gas as an example, show the relationship between moles, mass and number of entities

Answer 1

1. Welcome to OpenStudy! :-) Most under-read thing on the site for new people (including myself initially: http://openstudy.com/code-of-conduct)
2. One question per topic is preferred
3. Dimensional analysis, if I recall is just a fancy way of saying convert units like so:


Important note: (100 cm)\(^3\) = 100\(^3\) cm\(^3\) = 1000000 cm\(^3\)
\[1 \cancel{m^3} \cdot \left[ \frac{(100\ \cancel{cm)^3}}{(1\ \cancel{m)^3}} \cdot \frac{1\ mL}{1\ \cancel{cm^3}} \right]=?\]
\[1\ \cancel{nm} \cdot \left[ \frac{1\ \cancel{m}}{1,000,000,000\ \cancel{nm}} \cdot \frac{1\ km}{1000\ \cancel{m}} \right]=?\]

4. Always write your units, so you can see if things cancel out as they should to get the right answer. This remains true in upper level chemistry and physics ;-)