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The crew of Apollo 9 collected moon rocks to bring back to Earth. Three of the rocks had masses of 9.60 g, 0.00345 kg, and 195 mg. What was the total mass of these rocks reported in grams?

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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