Does substitution reactions cause haloalkanes?

Find the mass in grams of 1.37x1020 particles of h3po4

What is the empirical formula for c4h8o2

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.