Arock has a mass of 12000 g. it contains 300.0 grams of gold. what is the mass percent of gold in the rock? 25.00% 4.000% 2.500% 100.0%

The mass percent of gold in the rock is 2.500 %

Explanation:

Step 1: Data given

Mass of the rock = 12000 grams

Mass of gold = 300.0 grams

Step 2: Calculate mass %

Mass % = mass of gold / mass of gold

Mass % = (300.0 grams / 12000 grams) * 100 %

Mass % = 2.500 %

The mass percent of gold in the rock is 2.500 %

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