Question

Question Completion Status Support QUESTIONS 5 points The overall chemical reaction for combining the 4 chemical reactions mentioned in your procedure is given by the following reactions 2Als) 2OH() + 4H2SO4 +20000)-> SO42128002H00 + 3H2 500 g of aluminum is used in this reaction and aluminum is the limiting r ent, how many grams of alum(KASO02.12H00) can be expected to form in this reaction Molar mass of alumin i o molar mass of alum-474.39 mol O 1.0.0370 02.17.5g 3.3528 48.88 QUESTION 10 5 points A heavy object, which appears metalic in nature was heated at high temparatur Upon congwe observed that the mass of the metal object is lower. Which of the following is a reasonable hypothesis The object is a metalic Oxide which looses wy s upon heating 02. The object is not a pure element, because I lose weight The object does not burn in a 04 Al 1.2.3 observations are correct

Answer 1

Q1 ) In the Image attached .

* 2 KOH(aq) + 4H2SO4 (aq) 1241012) - 2 KM (50); Cum Imole Alum (AS I mole Al From thin chemical equation (Polanced), 2 mole of Al give a mole of kAllson), 12/20 se 2x 27 (2) give 2x(474.39 g 20982 279) 474.39g - 54 gn gines 948.78 g (alum) - Ig will give 948.78 g (alum) Then, 0.500 g will give - qu8.78 *0.500 Aluminium LILLLLLLL S4 - 18.178 g / alum do, correct option 18 2 8.8 g 0 T Answer

Q2 ) All the observations are correct. The object is a metal oxide which upon heating loses oxygen and thus its weight will be reduced. As it is a metal oxide, we cannot say it a pure element. Also it does not burn in air otherwise its weight would increase, but as it gets lowered so we can say it does not burn in air.

So option d is correct.

HOPE IT HELPS