The energy from 0.02 moles of butane is used to heat 328 grams of water. the temperature of the water rose from 298 k to 343 k. (the specific heat capacity of water is 4.18 j/k g.) what is the enthalpy of combustion? a. 1,578.01 j b. 3,084,840.0 j c. 23,513,336 j

Find the protons, electrons and neutrons for strontium with a mass of 83

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

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains