Question

calculate number of molecules in 51 gram of ammonia​

Answer 1

no. of moles =51 ÷17

=3

3×6.022×10 ki power23 =no. of molecules

18.066×10 ki pwer 23 is the answer

hope it will help you

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Answer 2

Answer:

number of molecules = 1.8 x 10²⁴

Explanation:

number of molecules = number of moles x 6 x 10²³

• we have to find number of moles in order to find the number of molecules.

mole = mass given/ molar mass (Mr)      (mass=51g , and Mr= 14 + 3 = 17 g/mol)

        = 51/17 = 3 mol

• now apply the formula for finding number of molecules.

no. of molecules= no. of moles x 6 x  10²³

                          = 3 x 6 x 10²³

                           = 1.8 x 10²⁴