2 examples of when scientists used space probe technology to find out more about comets.
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Ответ:
Ответ:
4.65 moles
Explanation:
1 mole ---> 6.022×10²³ atoms of si
X mole ---> 2.8×10²⁴ atoms of si
X= 2.8×10×10²³/6.022×10²³
=28/6.022
=4.65moles