Calculate the mass of hydrazine (N2H4) that contains a trillion (1.000 * 10^12) hydrogen atoms:

Question

Calculate the mass of hydrazine (N2H4) that contains a trillion (1.000 * 10^12) hydrogen atoms.

Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.

Answer 1

Yasmine

There are about 6.02 x 10²³ hydrogen atoms in a mole (Avogadro's constant)

So there will be (1000 x 10¹² / 6.02 x 10²³ ) moles of hydrogen atoms - call this number x

Because there are 4 hydrogen atoms per molecule of N2H4, that means we have (x/4) moles of this

Find the molar mass of N2H4 in g (2 x atomic weight of N + 4 x atomic weight of H)

Multiply this by (x/4), that gives the required mass

Mike