Zadanie 11b
Cyclopentane is a component of petrol. Its specific energy, the energy released per kilogram of fuel burned, is 4.69 × 107 J kg−1. Calculate the enthalpy of combustion of cyclopentane, C5H10, in kJ mol−1. Use…
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Cyclopentane is a component of petrol. Its specific energy, the energy released per kilogram of fuel burned, is 4.69 × 107 J kg−1. Calculate the enthalpy of combustion of cyclopentane, C5H10, in kJ mol−1. Use…
Which combination best describes SO32−? A. 4 electron domains around S, trigonal pyramidal, 107° B. 3 electron domains around S, trigonal planar, 120° C. 4 electron domains around S, tetrahedral, 109.5° D. 3 electron domains around…
Which pair of liquids is immiscible? A. CH3OH and CH3CH2CH2OH B. CH3COCH3 and H2O C. C6H14 and CCl4 D. C6H12 and H2O
Lidocaine and procaine are local anaesthetics. Their structures are shown. Deduce the name of one functional group that is present in both molecules and the name of one functional group that is present in procaine only.
A 52.0 g piece of zinc at 90.0 °C is dropped into 80.0 cm3 of water at 20.0 °C. The final temperature of the water is 24.0 °C. The specific heat capacity of zinc is…
Diclofenac, an anti-inflammatory drug, is often supplied as its sodium salt, which dissolves in water more readily than the diclofenac molecule itself. Circle the functional group that reacts with sodium hydroxide when this salt is prepared.
A student determined the enthalpy change of combustion of ethanol by burning it in a spirit burner under a copper can containing 150 cm3 of water. The value obtained was less exothermic than the literature value. Which modification would improve the…
What is the enthalpy change of reaction, ΔH⊖ in kJ mol−1, for the partial hydrogenation of ethyne to ethene? C2H2(g) + H2(g) → C2H4(g) ΔH⊖ = ? C2H2(g) + 2 H2(g) → C2H6(g)…
Standard enthalpy changes of reaction are provided for the following reactions. C(s) + O2(g) → CO2(g) ΔH⊖ = −394 kJ…
A single dose of an antacid tablet contains 1.850 g of sodium hydrogencarbonate, NaHCO3, and 0.600 g of calcium carbonate, CaCO3. Stomach acid is hydrochloric acid. Mr(NaHCO3) = 84.01 and Mr(CaCO3) = 100.09 Determine the amount of…