Sample of ethane (C2H6) was combusted completely and the water that formed has a mass of 1.61 grams. How much ethane, in grams, was in the sample?

During which movies do spring tides new moon first quarter waxing gibbous waxing

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false