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2.6 Problem Solving Using Unit Conversion

- For two units that describe the same quantity, write a conversion factor.

- The daily value is 150 mcg.

- The gold jewelry contains a lot of gold.

- A liter of milk costs $1.65.

- 1000 kilo is a metric ton.

- An hour has 60 minutes.

- There are 7 days in a week.

- There is a can of Coke.

- There is a label on a bottle that tells you how much of a drug you can take per 1 mL.

- There is one yard.

- The daily value is 70.

- The weight of one kilogram is 2.20 lbs.

- A car goes 27 miles per gallon of gas.

- By mass, sterling silver is 93% silver.

- The acids can be identified by writing the equality and two conversion factors.

- The liter is 1.06 quarts.

- The store sells oranges for $1.29 per pound.

- 100 mL is contained in one deciliter.

- A ring has 75% gold by mass.

- The daily value is 3.5 g.

- The car traveled 26.0 km on 1 L of gasoline.

- The mass of Earth's crust is 28.2%.

- Change from one unit to another using conversion factors.

- The process of problem solving in chemistry often requires one or more conversion factors to be changed.
- The unit of the given and the unit of the needed are identified for the problem.
- Sample Problem 2.8 shows how the problem is set up with one or more conversion factors used to convert the given unit to the needed unit.

- Greg's doctor ordered a heart exam.
- The dosages of pharmaceuticals are based on body mass.

- To convert the given unit to the needed unit, you have to write a plan.

- The equalities and conversion factors are listed.

- To calculate the answer, set up the problem to cancel units.
- Write the given, 164 lbs, and use the conversion factor that has lbs in the bottom number to cancel lbs in the given.

- The needed unit is in the numerator.
- After all the other units have canceled out, the unit you want in the final answer is the one that remains.
- This is a way to make sure that the problem is set up correctly.

- The numerical answer is adjusted to give a final answer with the proper number of significant figures.

- The answers to numerical problems contain a number and a unit.

- A total of 2500 mL of boric acid antiseptic solution is prepared.

- One factor follows the other in setting up these problems.
- The calculations can be done without writing intermediate results once the problem is set up.

- The process is worth practicing until you understand unit cancelation, the steps on the calculator, and rounding off to give a final answer.
- When two or more conversion factors are required, the final answer will be based on getting a final calculator display and rounding off zeros to give the correct number of significant figures as shown in Sample Problem 2.9.

- Greg has been diagnosed with a disease.
- His doctor prescribes a small amount of the drug to be taken once a day.

- The given and needed quantities should be stated.

- To convert the given unit to the needed unit, you have to write a plan.

- The equalities and conversion factors are listed.

- To calculate the answer, set up the problem to cancel units.
- The metric factor can be used to cancel milligrams and the clinical factor can be used to get the number of tablets.

- There is a bottle of cough syrup.
- If four times a day is given, it is measured for a patient.

- A person with 16% body fat by mass exercises regularly.

- To convert the given unit to the needed unit, you have to write a plan.

- The equalities and conversion factors are listed.

- To calculate the answer, set up the problem to cancel units.

- 1.33 lbs of ground round is contained in a package.

- Change from one unit problem to another using conversion factors.

- 5000 mL is the volume of a cooler.

- A hummingbird has a mass.

- There is a balloon with a large volume.

- The daily value is 800.

- A glass of orange juice contains a lot of juice.

- The following conversions can be performed using metric and 2840 mg of sodium.

- A jar has olives.

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