Answer :
The total mass of three moon rocks collected by the crew of the Apollo 9 was 13.245 g.
The total mass of moon rocks collected by the crew of the Apollo 9 can be calculated by converting all the given masses to the same unit of measurement, i.e., grams, and then adding them up.
Given: Mass of the first rock = 9.60 g
Mass of the second rock = 0.00345 kg = 3450 mg
Mass of the third rock = 195 mg
Converting all the masses to grams:
9.60 g
0.00345 kg × 1000 g/1 kg = 3.45 g
195 mg × 1 g/1000 mg = 0.195 g
Adding all the masses:
Total mass = 9.60 g + 3.45 g + 0.195 g = 13.245 g
Therefore, the total mass of the moon rocks collected by the crew of the Apollo 9 was 13.245 g.
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