In order to change grams of a substance to moles of the same substance, or vice versa, the following should be used: a) mole ratio b) avogadro's number c) molar mass d) mole fraction

C) molar mass

Explanation:

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In the calculations in chemistry, one of the major computations involve the conversion from mass to mole considering that there is no equipment that allows us to measure the exact moles of a substance since it depends on the type of atom, in spite of this fact, balances have been widely used to measure a substance's mass. In such a way, it is possible to relate them via the molar mass since it relates how many grams of a substance are contained in one mole of such substance. For instance, one mole of sodium chloride has  58.44 grams of sodium chloride or vice versa, so its molar mass is .

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why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.