D is the answer.
On the left, there are 3 atoms of Ca, 2 atoms of Cr, 6 atoms of N, and 18 atoms of O.
On the right, there are 3 atoms of Ca, 9 atoms of N, 27 atoms of O, and 2 atoms of Cr.
H+ ions are proton charged ions that are present
a is the answer because all of the other answers are wrtong
Answer: 1.9 moles
Explanation:
Step 1: Determine how many grams of a substance are in the problem.
From the question; we have 62 grams of Oxygen
Step 2: With the aid of a periodic table, the atomic mass of Oxygen is 16g, but since oxygen is diatomic i.e O2, it's molecular mass would be 32g.
Step 3: Applying the mathematical expression for finding moles
Moles = Mass/ Molar Mass
= 62g/ 32 g
= 1.9
∴ 62g of oxygen is equivalent to 1.9 moles.
