The chemical equation represents the formation of water.

2 H2 + O2 → 2 H2O

What is the total number of grams of O2 needed to produce 54 grams of water?
A
36

B
48

C
61

D
75

The total number of grams of O2 is 48.0 grams (option B)

Explanation:

Step 1: Data given

Mass of water = 54.0 grams

Molar mass of water (H2O) = 18.02 g/mol

Step 2: The balanced equation

2 H2 + O2 → 2 H2O

Step 3: Calculate moles of H2O

Moles H2O = mass H2O / molar mass H2O

Moles H2O = 54.0 grams / 18.02 g/mol

Moles H2O = 3.00 moles

Step 4: Calculate moles O2

For 2 moles H2 we need 1 mol O2 to produce 2 moles H2O

For 3.00 moles H2O we need 3.00/2 = 1.50 moles O2

Step 5: Calculate mass O2

Mass O2 = moles O2 * molar mass O2

Mass O2 = 1.50 moles * 32.0 g/mol

Mass O2 = 48.0 grams

The total number of grams of O2 is 48.0 grams (option B)

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.