Calculate the number of hydrogen atoms in a 100.0 g sample of tetraborane (B4H10)

Question

Calculate the number of hydrogen atoms in a 100.0 g sample of tetraborane (B4H10).

Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.

Answer 1

In order to solve this question, we must do a series of conversions to get from grams of B₄H₁₀ to atoms of H. We start with this known information:

mass of sample is 100.0g B₄H₁₀

molar mass of B₄H₁₀ is 52.2334g/mol

100.0g B₄H₁₀ × (1 mol B₄H_{10 /} 52.2334g B₄H₁₀) × (6.022*10²³ molecules B₄H₁₀ / 1 mol B₄H₁₀) × (10 atoms H / 1 molecule B₄H₁₀)

= 1.1529*10²⁵ atoms H