If a sample of barium contains 2.3 x 1023 atoms of barium, how many grams of barium are in the sample? A) 0.38 g. B) 2.62 g. C) 52.4 g. D) 359.5 g.

Question

Chemistry

Brendon Golden

17 August, 04:21

If a sample of barium contains 2.3 x 1023 atoms of barium, how many grams of barium are in the sample? A) 0.38 g. B) 2.62 g. C) 52.4 g. D) 359.5 g.

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Answers (2)

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Ashlyn Waller · Answer 1

N = 2.3 * 10 ^23 atoms

Avogadro constant: N a = 6.02 * 10 ^ 23

n = N : N a = 2.3 * 10 ^23 : 6.02 * 10 ^23 = 0.381 mol

m = n * M = 0.381 mol * 137 g/mol = 52.197 ≈ 52.4 g

Answer: C) 52.4 g

Carly Mccarty · Answer 2

N = number of molecules

n = 2.3x10^23/6.022x10^23

= 0.381 mol

Now,

M = molar mass in g/mol

m = mass in grams

m=nxM

=0.381 molx137 g/mol

= 52.197g

So, the correct answer should be C