Pl! help! 20 points A sample of N2H4 has a mass of 25g. Identify the numerical quantity that is needed to convert the number of grams of N2H4 to the number of moles of N2H4. (You do not need to do the actual calculation.)

Explanation:

molecular weight of N₂H₄ is as follows

2 x 14 + 4 x 1 = 32

so 32 gram of N₂H₄  is equal to one mole of N₂H₄

25 gram of  N₂H₄ will be equal to 25 / 32 mole of  N₂H₄

so numerical quantity needed to convert grams of  N₂H₄  to mole is

1 / 32 or .03125 . This number needs to be multiplied with grams of N₂H₄

to convert it to number of moles.