You so much for me i don't know science that well trying to get better i've been getting better good grades but still need

Which best describes how johannes kepler developed his laws of planetary motion

What is the percentage of hydrogen in nitrogen trihydride

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.