How many moles are contained in 0.05 g of NaOH? Give your answer in scientific notation.?

Question

How many moles are contained in 0.05 g of NaOH? Give your answer in scientific notation.?

Answer 1

1.25 X 10^-3 moles of Na+ and the same number of moles of OH-1  = 1.25 X 10^-3 "moles " of NaOH

0.05grams/40 grams  /mol

Answer 2

To find the moles of NaOH, divide the grams of NaOH by the molar mass of NaOH.

The molar mass can be found by looking on the periodic table:

Na - 22.989

O - 15.999

H - 1.0079

MM = 39.98 = about 40 g/mol

0.05/40 = 0.00125 moles NaOH = 1.25 x 10^-3 moles NaOH

=)

Answer 3

Molecular Wt of the substance taken in Grams is equal to one mole of it.

Mol .Wt Of NaOH is 40. So 40 grams of it is equal to one mole. 0.05 g of NaOH is equal to 1/800 moles of NaOH

Answer 4

the atomic weight of NaOH is 39.99 g/mol

.05 g NaOH(1 mol NaOH/ 39.99 g NaOH) = 1.25x10^-3 mol of NaOH.