A mass of mercury occupies 0.950 L. What volume would an equal mass of ethanol o

Question

A mass of mercury occupies 0.950 L. What volume would an equal mass of ethanol occupy? The density of mercury is 13.546 g/mL and the density of ethanol is 0.789 g/mL. A) 0.0553 L B) 0.0613 L C) 16.3 L D) 18.1 L Combustion of hydrogen releases 142 kJ per gram of hydrogen reacted. How many kilocalories of energy are released by the combustion of 8.0 ounces of hydrogen? A) 7.70 times 10^3 kcal B) 19.2 kcal C) 1.54 times 10^4 kcal D) 2.69 times 10^5 kcal What is the ground-state electron configuration of Se^2-? A) [Ar]3d^10 4s^2 4p^2 B) [Ar]3d^10 4s^24 p^6 C) [Ar]3d^12 4s^24 p^4 D) [Ar]3d^10 4s^24 p^6 Of the following, which atom has the smallest atomic radius? A) Na B) S C) K D) Se Which pair of reactants will produce a precipitate when mixed together? A) HCl(aq) and Ca(OH)(aq) B) HCl(aq) and K_2CO_3(aq) C) HCl(aq) and Na_ 2S(aq) D) HCl(aq) and AgNO_3(aq) Which of the following represents the change in electronic configuration that is associates with the first ionization energy of Aluminum? A) [Ne]3s^1 3p^1 rightarrow [Ne]3s^1 + e^- B) [Ne]3s^23 p^1 rightarrow [Ne]3s^1 3P^1 C) [Ne]3s^23p^1 rightarrow [Ne]3s^2 + e^- D) [Ne]3s^2 + e^- rightarrow [Ne]3s^23 p^1 What is the general trend in ionization energy and electron affinity values? A) Both decrease as one traverses a period from left to right and both decrease as one descends a group. B) Both decrease as one traverses a period from left to right and both increase as one descends a group. C) Both increase as one traverses a period from left to right and both decrease as one descends a group. D) Both increase as one traverses a period from left to right and both increase as one descends a group.

Explanation / Answer

6) given that both have equal masses

We know mass is equal to volume * density

0.950 L * 13.546 g/mL = volume * 0.789 g/mL

Volume of ethanol =16.31 L

Option C

(7)

1 ounce = 28.35 g

Total mass = 28.35 *8 = 226.8 g

Total energy = 142 kJ/1g * 226.8 g = 32205.6 kJ

Heat released in calories = 32205.6 /4.18 = 7704 kCal

Option (A) is correct

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