10. Which of the following has the empirical formula CH: benzene, CsHs or acetyl
ID: 706738 • Letter: 1
Question
10. Which of the following has the empirical formula CH: benzene, CsHs or acetylene, CaH2? 11. What is the empirical formula of a compound that has the composition by mass of 29.5% N, 3.2%H, and 67.3% O? (N2HsOJ 12. Equal masses of the following elements were heated from 15°C to 90°C; copper (s 0.386 J/g C, iron (s 0.45 Jig C, lead (s 0.128 Jig C). Which one required the most energy? the substance from 85°C to 110°C? What is the specific heat of the substance? [0.5 callg C] absorbs 300. Joules of heat to become 78.2°C, what was its initial temperature? (68.5°c) 13. Calorimet tric analysis shows that for a certain substance, 1,020 calories is required to heat 78.6 grams of 14. A pure substance has a mass of 80.0 g and a specific heat equal to 0.385 J g1.c1. If this substance 2. In the following reaction, what amount of water must react to absorb 852 kJ of energy? (0.0685 L) Zn(s)+ H:0(g)Zno(s)+H:(g) AHan 224 kJ In the following reaction, if 4.0 moles of oxygen completely react, how much energy will be re KJ) 3. leased? [7a0 4 NHs (9)502 (9) 4NO (g) + 6 H0 (g) AHm -904.8 kJ ATOMS 1. Write the ground state electron configuration for the following atoms: sulfur, iron 2. For the elements listed in number 1 above, write the ground state orbital notation. 3. Which neutral atom has the same electron configuration as , molybdenum, uranium. a. N b. Ca C.Br 4. What is the temperature of 5.00 moles of an ideal gas in a 2.8 L container pressurized to 4.8 atm.? D 240.°c] 5. What is the mass of xenon in a sealed container with a volume of 5.4L at STP? [32 gl 6. A rubber ball is filled with 5.4 L of air at 28°C and a pressure of 1.8 atm. If the ball is taken outside day whereby the temperature of the ball rises to 46°C and the volume increases to 6.2 L, what will be th pressure of the air in the ball? [1.7 atm] a hot 7. If a rigid container that can withstand a total pressure of 4.9 atm is filled with 538 kg of pure oxygen at STP is heated to 593°C, will the container explode? Prove your answer. 8. If one has the same mass of the first five noble gases all at STP, which one would need the largest container. Prove your answer.Explanation / Answer
Ans 10 :
Empirical formula has the simplest ratio of elements present in the compound.
In benzene , the ratio of elements is 1 : 1 so its empirical formula will be CH
In C2H2 also , the ratio of elements is 1 : 1 , so its empirical formula will also be CH.
So both of the compounds have the empirical formula CH.
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