Engineering Board Exam Reviewer · Chemistry · medium

In the balanced equation for the combustion of methane, CH4 + 2 O2 CO2 + 2 H2O, how many moles of O2 are needed to burn 3 mol of CH4?

  1. 6 mol
  2. 3 mol
  3. 2 mol
  4. 1.5 mol

Answer

A. 6 mol

Solution

Mole ratio O2 : CH4 = 2 : 1 3 × 2 = 6 mol.

More Chemistry questions

  1. Balance the equation: C3 H8 + O2 CO2 + H2O. What is the coefficient of O2?
  2. A hydrocarbon contains 85.7% carbon and 14.3% hydrogen by mass. What is its empirical formula? (Use H = 1, C = 12, N = 14, O = 16, Na =…
  3. A compound has the empirical formula CH2O and a molar mass of 180 g/mol. What is its molecular formula? (Use H = 1, C = 12, N = 14, O =…
  4. A compound contains 40% carbon, 6.67% hydrogen and 53.33% oxygen by mass. What is its empirical formula? (Use H = 1, C = 12, N = 14, O =…
  5. What is the percentage by mass of carbon in glucose ( C6H12O6)? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)
  6. What is the percentage of calcium by mass in CaCO₃? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)
  7. What is the percentage by mass of oxygen in water? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)
  8. How many atoms are in 3 mol of helium?
  9. What is the mass of 0.25 mol of sodium hydroxide ( NaOH)? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)
  10. How many molecules are in 44 g of carbon dioxide? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)

All Chemistry Reviewer questions