Calculate the amount of substance corresponding to 4.9 g of phosphoric acid.
| September 1, 2021 | education
Given:
m (H3PO4) = 4.9 g.
Find:
n (H3PO4) =?
Solution:
1) The amount of substance is determined by the formula: n = m: M.
2) Find the molecular weight of phosphoric acid using the periodic table:
M (H3PO4) = (1 x 3) + 31 + (16 x 4) = 98 g / mol.
3) n (H3PO4) = 4.9 g: 98 g / mol = 0.05 mol.
Answer: n (H3PO4) = 0.05 mol.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.
