Adding helium to a balloon increased its volume from 234.4 mL to 2.844L if the final number of moles of helium in the balloon is 34.6 what the

Adding helium to a balloon increased its volume from 234.4 mL to 2.844L if the final number of moles of helium in the balloon is 34.6 what the initial number of moles of helium in the balloon?Assume the balloon contained only helium initially