А19 Calculate the number of atoms of nitrogen in 20 g

If the total amount of your purchases from the seller nikole more than:
- 463 ₽ the discount is 5%

Sold 1
Refunds 0
Good feedbacks 0
Bad feedbacks 0

19. Calculate the number of atoms of nitrogen in 20 g of urea (NH2) 2CO, containing 10% non-nitrogenous impurities.