Question

Calculate the mass in kilograms of 1,9x10^22 molecules of NO2.

I found 1.45x10^-4 Kg NO2 but I think it is wrong

Answer 1

How much does 1 mole of NO2 weigh? Then divide that by \[6.022x10^{23}\] Then Divide that by 1000 (1000g in 1kg)

Answer 2

I get 1.45 Kg NO2

Answer 3

Correct but that is in grams. \[1.45\times \frac{ 1kg }{1000kg}= 0.00145kg\]
You do not have to put this in scientific notation as it only needs 3 significant figures.

Answer 4

So your original answer is correct, but didn't need to be in sci/notation

Answer 5

so 1.45x10^-3

Answer 6

thank you!!!

Answer 7

You are welcome :) *correction not x10^-4 but -3