The atomic mass of potassium is 39.1. what is the mass of 6.02 × 1023 atoms of potassium? a. 39.1 mg b. 39.1 g c. 39.1 kg d. 6.02 × 39.1 mg e. 6.02 × 39.1 g

B. 39.1 g.

Explanation:

∴ 6.02 x 10²³ atoms are in 1.0 mol of K.

∴  mass of K =  no. of moles of K x atomic mass of K = (1.0 mol)(39.1 g/mol) = 39.1 g.

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so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer