Concept explainers
The unit “troy ounce” is often used for precious metals such as gold (Au) and platinum (Pt). (1 troy ounce = 31.103 g.) (a) A gold coin weighs 2.41 troy ounces. Calculate its mass in grams. (b) Is a troy ounce heavier or lighter than an ounce? (11b = 16 oz; 11b = 453.6 g.)
(a)

Interpretation:
From the given data’s, it should be calculated the mass of gold coinin grams and it should be checked whether a troy ounce is heavier or lighter than an ounce.
Concept Introduction:
Conversion formula;
Explanation of Solution
To determine: The mass of gold coin in grams
The unit of troy ounce is used for metal such as gold and platinum. A gold coins weights 2.41 troy ounce. Mass of gold coin in grams can be calculated by using conversion formula.
That is,
So,
(b)

Interpretation:
From the given data’s, it should be calculated the mass of gold coinin grams and it should be checked whether a troy ounce is heavier or lighter than an ounce.
Concept Introduction:
Conversion formula;
Explanation of Solution
To check: Whether a troy ounce is heavier or lighter than an ounce.
By using conversion factor, it can be check whether a troy ounce is heavier or lighter than an ounce.
That is, 1 troy oz should be converted to gram and the 1 gram should be converted to pound .at last 1 pound should be converted to ounce.
So the conversion can be done as follows;
So, it can be concluded that A troy ounce is heavier than an ounce
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