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

Crackers

Chemistry

3 August, 10:55

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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Aryana Yates · Answer 1

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

Nikolas Jensen · Answer 2

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