Calculate the number of calories in 1/4 lbs of margarine

There are 700 Cal in ¼ lb margarine.

Dietitians say there are anywhere from 150 Cal to 200 Cal in an ounce of margarine.  

Let’s split the difference and assume 175 Cal/oz.

a. Given: pounds of margarine

b. Want: number of calories

c. Equalities: 175 Cal = 1 oz; 16 oz = 1 lb

d. Conversion factors: 175 Cal/1 oz or 1 oz/175 Cal; 16 oz = 1 lb or 1 lb/16 oz

We choose the conversion factor that has the desired units on top.

Calculation:

No. of ounces = 0.25 lb × (16 oz/1 lb) = 4 oz

No. of Calories = 4 oz × (175 Cal/1 oz) = 700 Cal

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6