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 (1lb =16 oz; 1lb =453.6 g)?

Explanation:

a) 1 troy ounce is equal to 31.103 g

2.41 troy ounce is equal to 2.41 x 31.103 g

= 74.958 g

b) 1  ounce = 1 / 16 lb = 1/16 x 453.6 g = 28.35 g.

1 troy ounce = 31.103 g

so 1 troy ounce is heavier than 1 ounce.

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