How could you determine the amount of hydrogen needed for a space flight

Can you reduce your impairment by drinking coffee or cold showers? true or false?

Will mark brainliest how many electrons can be held in the energy level n = 4?

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ