What is the difference between N and n in the formula N = n NA?单项选择题

题目图片
A

a. N is the mass of the substance, n is the molar mass

B

b. N is the number of particles, n is the number of moles

C

c. N is the molar mass, n is the mass of the substance

D

d. N is the number of moles, n is the number of particles

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