In the following reaction, 8 grams of ethane are burned and 11 grams of CO2 is collected. What is the percent yield?
2C2H6 + 7O2 --> 4CO2 + 6H2O
Write the balanced equation for the reaction first. Aluminum combines with excess copper (II) sulfate in a single replacement reaction.

Which best describes how johannes kepler developed his laws of planetary motion

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]