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Please give me the key answers without the stepts

17. The measurement of heal flow is called Spectroscopy D Chromatography 18. An exothermic process the temperature of the surroundings Has no effect on D) Reonents takes of bear to raise the of 50.0 g of Fe temperature 19. Iron (Fe) has a specific beat of 0.450 Jg. c lt A) 563 J B) 5.62 C) 13 J 20. Bubble in answer choice A on your Scantron sheet. Questions 21-24 refer to the following scenario. A solution is prepared by dissolving 1500 g of MglNo, in water to make 500.0 ml of solution. Then, 25.00 mln of the Mg(NOht solution are diluled io a final volume of 5000 mL. 21. How many moles of Mg(No ae used in the initial solution? D) 0814 A) 0.150 22. What is the molar concentration (molarity) of the initial solution? 23. What is the molar concernation of the dilute solution? A) 0.101 24. How many moles of Noh are in 500 ml. of the dlae solution? Questions 25.2s refers the following scenario. Abomb calorimeter in using 0.7515 g of benzoic acid, which has a heat of combustion of 26.43 kl/g. The calorimeter of temperature by 548 c Then, 08115 g of an unknown substance is tested. resulting in 375 leased by the combustion of betroic acid How much hca 19.86 D 35.17 A) 26. What is the B) 0.2761 C Do 2.874 kurc released by the combustion of the unknown? A) 03854 kJ A) kJ of combustion of the unknown, in kury 185 28. What the is 0.2537

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Answer #1

17.Calorimetry

18. Increases, exothermic process releases heat.

19. Q = m*c*deltaT

= 50g*0.450J/g°C*25C

= 562.5J = 563J

21. Moles of Mg(NO3)2 = mass/molar mass

Mass = 150g

Molar mass = 148.3g/mol

Moles = 150g/148.3g/mol = 1.01mol

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