What is the general molecular formula for non-cyclic, saturated alkanes containing n carbon atoms?
Answer and explanation
Correct answer: A. C_n H_2n+2
- Step 1: Identify the bonding characteristics of alkanes: all single C-C and C-H bonds with no rings or multiple bonds.
- Step 2: Every carbon in an open-chain saturated alkane bonds to 2 hydrogens, plus 2 terminal hydrogens to cap the chain ends, yielding the formula .
Answer
C_n H_2n+2.
Why not the others: is for alkenes or cycloalkanes; is for alkynes; represents benzene ratio.
Practise more Chemical Reactions, Equilibrium and Thermochemistry.
Free questions with an explanation for every one, and full timed EmSAT Achieve (UAE) mock tests.
More Chemical Reactions, Equilibrium and Thermochemistry questions
- What is the pH of a 0.0050 M aqueous solution of barium hydroxide, Ba(OH)₂, assuming complete dissociation?
- For the exothermic equilibrium N₂(g) + 3H₂(g) ⇌ 2NH₃(g) (ΔH = -92 kJ/mol), which change will increase the equilibrium yield of ammonia (NH₃)…
- Calculate the standard enthalpy of reaction for: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l), given ΔH°f [CH₄(g)] = -75 kJ/mol, ΔH°f [CO₂(g)] = -394…
- The reaction 2NO(g) + O₂(g) → 2NO₂(g) has the experimental rate law Rate = k[NO]²[O₂]. If the concentration of NO is doubled while [O₂] is h…
- What is the solubility product constant (K_sp) of lead(II) chloride, PbCl₂, if its molar solubility in pure water at 25°C is 1.6 × 10⁻² M?
- Which pair of chemical species forms an effective buffer solution when mixed in equimolar amounts?