What is the molarity of a solution made by dissolving 4.88 g of KCl in 423 mL of solution? DO NOT INCLUDE THE UNIT IN YOUR ANSWER. (Neatly write your calculation on a scratch paper, show your work slowly on the webcam before you submit the test. Take a photo of your work, and submit it on Final Exam Work assignment on the module.)
Read DetailsAn element X has two stable isotopes, X-203 and X-205. The isotope X-203 has a molar mass of 202.97 g/mol and a relative abundance of 29.52%. The other isotope, X-205 has a molar mass of 204.97 g/mol and a relative abundance of 70.48%. What is the average atomic mass of the element X? DO NOT INCLUDE THE UNIT IN YOUR ANSWER. (Neatly write your calculation on a scratch paper, show your work slowly on the webcam before you submit the test. Take a photo of your work, and submit it on Final Exam Work assignment on the module.)
Read DetailsPotassium metal reacts violently when added to water according to the balanced equation: 2 K(s) + 2 H2O(l) → 2 KOH(aq) + H2(g) How many moles of H2O are needed to reactcompletely with 7.54 mol of K? DO NOT INCLUDE THE UNIT IN YOUR ANSWER. (Neatly write your calculation on a scratch paper, show your work slowly on the webcam before you submit the test. Take a photo of your work, and submit it on Final Exam Work assignment on the module.)
Read DetailsConsider the reaction, C2H4(g) + H2(g) —> C2H6(g), where ∆H= –137 kJ. How much heat is released when 3.60 mol of C2H4reacts? DO NOT INCLUDE THE UNIT IN YOUR ANSWER. (Neatly write your calculation on a scratch paper, show your work slowly on the webcam before you submit the test. Take a photo of your work, and submit it on Final Exam Work assignment on the module.)
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