- How much money does it cost in electricity to run a 500 watt light bulb for just 1 hour?

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One and a half billion divided by 30 million? When x=0 does it have a y-intercept when it goes through both the x-axis and y-axis? What mass of Al2O3 is produced when 81g of Al undergoes complete combustion (with workings please)? Find the energy of the photon required to excite a hydrogen atom from the n=1 state to the n=5 state.? When they travel to mars , will they come back ?