Hydrogen burns in air at a temperature well above 100 °C to form water - Edexcel - GCSE Chemistry - Question 4 - 2018 - Paper 1
Question 4
Hydrogen burns in air at a temperature well above 100 °C to form water.
(i) The boiling points of hydrogen and water are shown in Figure 3.
Use this information to... show full transcript
Worked Solution & Example Answer:Hydrogen burns in air at a temperature well above 100 °C to form water - Edexcel - GCSE Chemistry - Question 4 - 2018 - Paper 1
Step 1
Add the missing state symbols
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The complete equation with the state symbols is:
2H2(g)+O2(g)→2H2O(l)
Here, hydrogen is in the gaseous state (g) and water, formed at a temperature above 100 °C, is in the liquid state (l).
Step 2
State how the equation shows that the atom economy is 100%
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The equation shows that the atom economy is 100% because all atoms in the reactants are converted into the product with no waste products formed. This is evident as the mass of reactants equals the mass of useful products, indicating that no reactant is lost and all are utilized in the formation of water.
