Question

16 A student reacted 0.7655 g of chromium (at. wt 51.996 g/mol) with exactly 1.566 chlorine (at. wt.-35.453 g/mol). Convert both these masses to moles and determine the empirical formula (like A x) of the compound of Cr and CL. SHOW YOUR WORK gof 17. In a chemical reaction, the substance which gets used up first (or runs out first) is called the (write in the correct words). 18. In a chemical reaction, the maximum amount of product which can be made when one of the starting materials is completely used up is called the (write in the correct words). 19. Select from the choices below the blanks to correctly complete the sentence: The equation which relates the light absorbed through a solution to the concentration of that solution is and it is called Petit's Partition A/C A,C PV nRT Tolmen's Law Beer's Law L-½ mc A-ebC Lumens' Equation 20. In a certain titration, 25.00 mL. of HCl reacted exactly with 32.36 mL of 0.1250M NaOH What is the concentration (M) of the HCI? (The reaction stoichiometry is 1:1) (watch sf)

Answer 1

(16) atomic weight of chromium = 51.996 g/mol. atomic weight of chlorine = 35.453 g/mol. 51.996g chromium = 1 mole I gu 6 mole 0.7655 8 - *0.7655 now 35.453 g chlorine & I mole a *07655 = 0.01472 mole u I 1.566 - 35.453 mote g 35.453 = I x 1.566 = 0.044 17 mole 0.01472 0.04417 = 1:3. So the staitiomity will be codz. ② In a chemical reaction, the Substance which get used up first is called Limiting reagent 18 In a chemical reaction, I reaction, the maximum amount of the maxione product which can be made when one of the starting material is completely used up is called Theoretical yield. 19 The annuation which relates the light absorbed through a solution to the Concentration of funt solution is A=Ebe and it is called Beer's law. @ volume of Hel reauired = 25.00 me u of NaOH required - 32.36 me Strength of NaOH Solution (M) = be 0.1250 (M) now as we know that, V.S. = V₂52 v = volume of hell V₂ = u of NaOH Si= Strength of Ha S = u of NaOH So, 25x5,= 32.36*0. 1250 or Si= 32.36 x 0.1250 = 0.1618 (M) Strength of Hel is 0.1618 (m)