Which of these factors make hydrogen fuel cells a better option than burning fossil fuels? hydrogen fuel cells have a higher energy efficiency. hydrogen fuel cells create less pollution. burning fossil fuels relies on outdated devices and technology. pure hydrogen is more readily available than fossil fuels. hydrogen fuel cells are more expensive than fossil fuels.

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

Which of the following are good traits of a hypothesis? it will be able to be testedit can predict an outcomeit will explain the observationsall of these

What is the molar mass of the anhydrous compound? answer using four significant figures. 36.02 g/mol 120.15 g/mol 156.12 g/mol