How many sigma valence electrons in c14h10?

In C₁₄H₁₀, there are 14 carbon atoms and 10 hydrogen atoms. Each carbon atom contributes 4 valence electrons, and each hydrogen atom contributes 1 valence electron. Therefore, the total number of valence electrons is (14 × 4) + (10 × 1) = 56 + 10 = 66 valence electrons. Since all bonds in this molecule are sigma bonds, there are 66 sigma valence electrons.