Adding helium to a balloon increased its volume from 595.4 mL to 3.356 L. If the final number of moles of helium in the balloon is 25.9 mol, what was the initial number of moles of helium in the balloon

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

Which type of fossil does this image depict?

Which statement justifies that hydrogen peroxide (h2o2) is a polar molecule? the o – h bond is nonpolar and the molecule is asymmetric. the o – h bond is nonpolar and the molecule is symmetric. the o – h bond is polar and the molecule is asymmetric. the o – h bond is polar and the molecule is symmetric.