Question

I need help asap :( Its worth 60 points!!!!!!

20 grams of hydrogen reacted with oxygen to form 36 grams of H20 (water). How many grams of oxygen were used up in this reaction?

Answer 1

Mass of oxygen react = 32 g

Step-by-step explanation:

Given data:

Mass of hydrogen = 20 g

Mass of oxygen = ?

Mass of water formed = 36 g

Solution:

Chemical equation:

2H₂ + O₂ → 2H₂O

Number of moles of water formed:

Number of moles = mass/molar mass

Number of moles = 36 g/ 18 g/mol

Number of moles = 2 mol

No we will compare the moles of water with oxygen.

H₂O : O₂

2 : 1

when two moles of water formed one mole of oxygen react.

Mass of oxygen react:

Mass = number of moles × molar mass

Mass = 1 mol × 32 g/mol

Mass = 32 g