Chemistry – Course Note – Yanis Zeng
Search
Essays
Sign up
Sign in
Contact us
Tweet
Index
/Science
Chemistry
Chemistry 11 Assignment 2 Total 25 marks[pic 1]Please make sure you highlight your final answer. Failure to do so will result in one mark taken off.Part 1 For the next questions, clearly show all the steps in solving the problems. 0.5 marks will be deducted for each time there is a significant figure error or appropriate units are not used!1. What is the molar mass (to the nearest tenth of a gram/mole) of each of the following (2 marks)a. KClK: 1 x 39.1 = 39.1Cl: 1 x 35.5 = 35.5 39.1 + 35.5 = 74.6 g/molb. Al2(SO4)3Al: 2 x 27.0 = 54.0S: 3 x 32.1 = 96.3O: 12 x 16.0 = 19296.3 + 54.0 + 192 = 342g/mol2. Convert the following mass into moles (1 mark) 19.5 grams of Al(OH)3Al: 1 x 27.0 = 27.0O: 3 x 16.0 = 48.0H: 3 x 1.0 = 3.027.0 + 48.0 + 3.0 = 78.019.5 grams Al(OH)3 x 1 mole / 78.0 grams Al(OH)3 = 0.250 mol Al(OH)33. Convert the following moles into masses (1 mark) 2.00 moles of N22.00 moles x 28.0 g / 1 mole =56.0g N24. How many molecules are present in 1.5 moles of NaCl? (1 mark)1.5 moles NaCl x 6.02 x 10 ^23 molec NaCl/ 1 mole NaCl = 9.0 x 10^23 molec NaCl5. How many atoms of chlorine are in 19.0 grams of MgCl2? (1 mark)Mg: 1 x 24.31 = 24.31Cl: 2 x 35.45 = 70.924.31 + 70.9 = 95.21 95.2 g/mol[pic 2]19.0 g MgCl2 x 1 mol MgCl2 /95.2 g Mg Cl2 x 6.02 x 10^23 molec/ 1 mol x 2 atoms/ 1 molec = 2.40 x 10 ^23 atoms6. What is the volume of 2.60 moles of CO2(g) at STP? (1 mark)2.60 mol CO2 x 22.4 L CO2 / 1 mol CO2 = 58.24 L CO2 58.2 L CO2[pic 3]7. What is the mass of 50.0 L of O2(g) at STP? (1 mark)50.0 L O2 x 1 mol O2 / 22.4 L O2 x 15.99 g O2 / 1 mol O2 =35.7 g O28. What is the percent composition of chlorine in PCl5? (1 mark)Cl: 5 x 35.45= 177.25P: 1 x 30.97 = 30.97177.25 + 30.97 = 208.22 Cl: 177.25/208.22 x 100% = 85.13 % The percent composition of Chlorine is 85.13 % 9. Steven analyzed a compound and found it to be 52.7% Potassium and 47.3% Chlorine. He determined the empirical formula to be … (1 mark)52.7 g K x 1 mole K / 39.1 g k = 1.35 mol K/ 1.33 ≈ 147.3 g Cl x 1 mole Cl/ 35.45 g Cl = 1.33 mol Cl/1.33 = 1Empirical formula: KCl10. If the empirical formula of a compound is CH2 and its molar mass is 70.0, then what is its molecular formula? (1 mark)12.0 C + 2 x 1.0 H = 14.0g/mol70.0 g/mol ÷ 14.0g/mol = 5 5 x CH2 = C5H1011. If 0.30 mol NaCl goes into a solution with 4.00L water, the molarity of NaCl is (2 marks)M = n / V M= 0.30 mol / 4.00LM= 0.0750 mol/ L 12. If 100.0 ml water is added to 150.0 ml of a 2.00M HCl solution, the new molarity of HCl is (2 marks)150.0 mL x 1 L/ 1000 mL = 0.1500L100.0Ml x 1L/1000mL= 0.1000L n = mv
Continue for 3 more pages »
Read full document
Download as (for upgraded members)
Citation Generator
MLA 7
CHICAGO
(2017, 10). Chemistry. EssaysForStudent.com. Retrieved 10, 2017, from
“Chemistry” EssaysForStudent.com. 10 2017. 2017. 10 2017 <
"Chemistry." EssaysForStudent.com. EssaysForStudent.com, 10 2017. Web. 10 2017. <
"Chemistry." EssaysForStudent.com. 10, 2017. Accessed 10, 2017.
Essay Preview
By: Yanis Zeng
Submitted: October 31, 2017
Essay Length: 908 Words / 4 Pages
Paper type: Course Note Views: 338
Report this essay
Tweet
Related Essays
Brief Historical Development and Contributions of Chemistry for Modern Civilization
Brief Historical Development and Contributions of Chemistry for Modern Civilization Introduction: As defined by Oxford Dictionary, Chemistry is the scientific study of the structure of
847 Words | 4 Pages
Organic Chemistry
Homologous Series: An homologous series is a set of compounds whose components differ by a single repeating functional group. In the case of (straight chain)
262 Words | 2 Pages
Multistep Synthesis Chemistry Experiment
Multistep Synthesis of Tetraphenylcyclopentadienone In this laboratory experiment a synthesis was performed through several separate steps. The purpose of the experiment was to synthesize tetraphenylcyclopentadienone
1,813 Words | 8 Pages
Chemistry Independent Study
Chemistry Independent Study: Gas Laws Gas Laws Since the days of Aristotle, all substances have been classified into one of three physical states. A substance
2,517 Words | 11 Pages
If We Had Known About Green Chemistry in 1951, How Would Things Be Different Today?
If We Had Known About Green Chemistry In 1951, How Would Things Be Different Today? Green Chemistry is the making of chemical products that reduces
716 Words | 3 Pages
Similar Topics
Chemistry Planning Designing Lab
Chemistry Study Guide
Get Access to 89,000+ Essays and Term Papers
Join 209,000+ Other Students
High Quality Essays and Documents
Sign up
© 2008–2020 EssaysForStudent.comFree Essays, Book Reports, Term Papers and Research Papers
Essays
Sign up
Sign in
Contact us
Site Map
Privacy Policy
Terms of Service
Facebook
Twitter