You give a sample containing .90 moles of a substance

a) how many atoms are in the sample if the substance is copper

a. they are both space stations

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why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.