Final answer:
The dissolved oxygen concentration in the solution is 200 ppm.
Step-by-step explanation:
To calculate the dissolved oxygen concentration in parts per million (ppm), we need to convert the given mass of oxygen to moles, then calculate the concentration in mol/L, and finally convert it to ppm.
Given: 0.0070 grams of Oxygen
Molar mass of Oxygen: 16.00 g/mol
Step 1: Convert mass to moles:
0.0070 g ÷ 16.00 g/mol = 0.00044 mol
Step 2: Calculate concentration in mol/L:
0.00044 mol ÷ 2.25 kg = 0.00020 mol/L
Step 3: Convert concentration to ppm:
0.00020 mol/L × 10^6 = 200 ppm