Answer:

Explanation:
1. Calculate the moles of CoF₂ needed

2. Calculate the mass of CoF₂

To answer this question, you need to understand the naming of meter unit system. The unit pm stands for pico meter which was 1/1000 of nanometer. Then, the calculation would be:
Number of atom= container length / atom diameter
Number of atom = 25 nm x (1000pm/nm) / 144pm= 173.6 atom
Answer:
C. SOIL THAT IS A MIXTURE OF STILT AND CLAY
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