How much heat (in kJ) is evolved (under standard conditions) when 97.55 g of copper reacts to form copper(II) oxide

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

particle   p is an electron and particle q is a neutron