Calculate the mass of butane needed to produce 98.3 g of carbon dioxide

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

What is the value of the standard enthalpy of formation of an element in its most stable form?

The sum of the oxidation numbers in a neutral compound is always