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A student was instructed to prepare 19.2 g of pure Na2S2O3·5H2O. The student was provided solid Na2S2O3·5H2O, containing 15 wt. % water-insoluble impurities. According to the procedure for purification of this compound by recrystallization, a saturated (at 40 oC) aqueous solution of sodium thiosulfate is first prepared. The suspension is heated to 50 °С and subsequently filtered hot. The filtrate is then cooled to 0 °C for crystallization. The solubility of Na2S2O3 at 40 С is 102.6 g per 100 g of water, at 0 °С it is 52.5 g per 100 g of water. What mass of contaminated Na2S2O3·5H2O and water (g) should the student use for recrystallization?
Enter the answer rounded to integer values in the format of ... and ..., for example, 10 and 12.

A metal has a face-centered cubic crystal structure with a unit-cell parameter of 3.62 Å (Angstrom). Calculate the atomic radius of this metal (Angstrom). Enter the answer rounded to two decimal places, for example 2.89.

A student was instructed to prepare 19.2 g of pure Na2S2O3·5H2O. The student was provided solid Na2S2O3·5H2O, containing 15 wt. % water-insoluble impurities. According to the procedure for purification of this compound by recrystallization, a saturated (at 40 oC) aqueous solution of sodium thiosulfate is first prepared. The suspension is heated to 50 °С and subsequently filtered hot. The filtrate is then cooled to 0 °C for crystallization. The solubility of Na2S2O3 at 40 С is 102.6 g per 100 g of water, at 0 °С it is 52.5 g per 100 g of water. What mass of contaminated Na2S2O3·5H2O and water (g) should the student use for recrystallization?
Enter the answer rounded to integer values in the format of ... and ..., for example, 10 and 12.

CoachFaith:
“Sir, can we all become entrepreneurs? And if not, what advice do you have for those of us who look forward to being gainfully employed?”


A young man delivered a dazzling lectures at NYSC Orientation Camp Nkewere LGA of Imo State that changed and determined my passion in life.

He titled the talk “The Jobs Are No More, So Think Entrepreneurship!” I thought, what a great Topic… so I had a tough time battling with rushing thoughts during his ‘sweet’ presentation and at the end I was opportune to ask a question.

FREE E-Book: 500+ Interview Questions for Grads, Executives & Specialists! DROP YOUR EMAIL

I asked, “Sir, can we all become entrepreneurs? And if not, what advice do you have for those of us who look forward to being gainfully employed?”

Unfortunately, he never answered the question. He instead passed a cruel remark on me

He relied “…only lazy people think that way”.

I also wish he never answered me that way because he was booed off the stage and literally ‘Control Z’ all the nice impression he had made.

After my NYSC in 2011, I embarked on a JOB SEARCH ADVENTURE - Took about 26 interviews in 3 years! Changed Job 4 times between 2011& 2013, Completed a Masters Degree in Personnel Psychology...all in the bid to answer my own Questions & Help you with the same!

I Presently work as a Administrative Officer (HR) @ Federal University Oye-Ekiti. Having sat on a couple of interview panels, I have compiled those daunting questions that I have heard or asked at panels. This E-book addresses a portion of my June-2010-unanswered-question.

FREE E-Book: 500+ Interview Questions for Grads, Executives & Specialists! DROP YOUR EMAIL


@OluwatadeFaith
Author, Speaker & (HR) Strategists
Career & Professional Development Advisor
askcoachfaith@gmail.com

nwobynelson@yahoo.com