What is the balanced thermochemical equation describing the combustion of octane (Enthalpy H= -5500 kJ/Mol). (Need to balance the equation with a 1 in front of the octane. Thank you!!

How did planetesmals form planets? a. they broke apart into smaller chunks.b. they collided and stuck together.c. they cooled and pulled ice together.d. they began to rotate.

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver