The atomic mass of hydrogen-1 is 1. 008 and the atomic mass of helium-4 is 4. 3. Find the difference in grams between 4 moles of hydrogen and one mole of helium.

Luminous objects such as flashlights emit light that we can see. how do we see an object that isn’t luminous? a. the object emits light that reaches our eyes. b. light reflects off the object and reaches our eyes. c. light passes through the object uninterrupted. d. light is fully absorbed by the object. e. we can’t see an object that isn’t luminous.