C4H10+ 02= C02+ H20
explanation
a combusting is made of carbon dioxide and water.
<h3>2C4H10+13/2O2 -> 8C02+10H2O</h3>
C=4 C=1 x4 =4
H=10 H=2x5=10
O=2 x13/2=13 O = 8+5=13
B An enclosed pendulum is not acted on by air resistence or gravity. Plus, pendulum's in clocks are electronic (I think) so that's why it keeps moving back in forth. (at least i think so)