Which coefficient of o2 is needed to balance the equation c3h8 + o2 → 3co2 + 4h2o?

a.2
b.3
c.5
d.6

Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

Figure 9 on page 362 shows various motions of balls. the curved path followed by the yellow ball in b in picture b is result of a) inertia b) centripetal motion c) gravity and horizontal velocity d) linear motion

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.