Dimensional Analysis - Problem
Solving
Chemistry 121 -
In class we discussed some
guidelines used to solve problems in chemistry. I demonstrated finding
the solution to the first problem listed below. The remaining problems are
for your own practice either individually or for working in groups. They
will not be handed in – so use them as a study aid. Check my (and your classmates') answers to
these.
3.10 x 102
tons of aluminum can tabs have been recycled over the past decade to support
the Ronald McDonald House of the Twin Cities. If 1 tab has a mass of 0.3572 g,
how many tabs have been recycled? 1 ton = 2000 lbs.; 1 kg = 2.205 lbs
Answer = 7.87 x 108 tabs recycled
Ole collected 3.47 pounds of
can tabs. How much are these worth if the price per ton (high grade Al) is
$1431.69? 1 ton = 2000 lbs
Answer = $2.48
The Ronald McDonald House
raises an average of $40,000.00/yr from recycled can tabs. How many people
collect can tabs if each person collects 4.0 lbs per year? 1 ton = 2000 lbs; 1
ton = $1431.69
Answer = 1.4 x 104 people
Aluminum has a density of 2.69
g/cm3. What is the minimum size cubic container needed to hold 1.70
pounds of aluminum (express the answer by stating the length of one side of the
box in cm)?
Answer = 6.59 cm
in inches?
Answer = 2.59 in
For more information about the Ronald McDonald House of the Twin Cities, click on the URL http://www.rmhmpls.com/.