Pentane has _____ structural isomers.
Pentane has three structural isomers: n-pentane, isopentane (methylbutane), and neopentane (dimethylpropane), differing in the arrangement of their carbon atoms.
17.5% of 400 – 24% of 150 = ?
3.3 Times 2/27 of 40% of 364=?
2/5 of 3/4 of 7/9 of 14400 = ?
?2 + 114 - 48 ÷ 2 × 5 = 163
(3984 ÷ 24) x (5862 ÷ 40) = ?
2916 ÷ 54 = ? + 27
[(4√ (7) +√ (7))× (7√ (7) + 6√ (7))] - 87 = ?
...95% of 830 - ? % of 2770 = 650
125 ÷ 5 + 14 × 4 = ? + 72 ÷ 4 – 35
