레포트항공대 2008 일반화학1 중간족보

레포트항공대 2008 일반화학1 중간족보

[레포트]항공대 2008 일반화학1 중간족보.doc

본문 CH101 GENERAL CHEMISTRY I MID TERM EXAMINATION FALL SEMESTER 2008 Wednesday 22 October 2008: 1900 2100 Attempt all SIX questions A copy of the periodic table is supplied 1. (i) Comment on the accuracy and precision of the following set of replicate measurements, if the accepted (real) value is 0.0919. 0.0902; 0.0884; 0.0886; 0.100 (2 points) (ii) Calculate the length of the sides of a cubic volume occupied by a single benzene molecule (molar mass of benzene = 78.114 g mol-1, density of benzene = 0.8765 g cm-3). (4 points) 1 A ( 10-8 cm (iii) Calculate the mass of potassium hydroxide (KOH) contained in 25.30 ml of 0.102 M (mol l-1) solution. Show working. molar masses (g mol-1): H = 1.008, O = 15.999, K = 39.098 (3 points) 1. (i) Mean value = 0.918 (1 point), hence accuracy high (good) (1 point), but precision low (poor) (because of scatter or wide range: 0.0884 0.100) (1 point). (ii) Molar volume = volume occupied by 1 mol of molecules = 78.114 (g/mol)/0.8765 (g/cm3) = 89.12 cm3/mol Volume occupied by one molecule = 89.12 (cm3/mol)/6.022 x 1023 (/mol) = 1.48 x 10-22 cm3 This is equivalent to a cube of sides 3((1.48 x 10-22) cm3 = 6.20 x 10-8 cm or 6.20 A (4 points for this result with reasonable working) (iii) Number of moles = 25.30 x 0.102 mol 하고 싶은 말 좀 더 업그레이드하여 자료를 보완하여, 과제물을 꼼꼼하게 정성을 들어 작성했습니다. 위 자료 요약정리 잘되어 있으니 잘 참고하시어 학업에 나날이 발전이 있기를 기원합니다 ^^ 구입자 분의 앞날에 항상 무궁한 발전과 행복과 행운이 깃들기를 홧팅 키워드 일반, 일반화학, 중간족보, 레포트, 족보, 중간