How many moles of H^+ (aq) ions are present in 750 mL of 0.65 M hydrochloric aci

Question

How many moles of H^+ (aq) ions are present in 750 mL of 0.65 M hydrochloric acid? A) 0.98 mol B) 0.49 mol C) 1.2 mol D) 0.87 mol E) 0.65 mol During a titration, it is found that 53.5 ml. of a solution of NaOH is needed to neutralize a solution that contains 1.86 g of HCI. What is the concentration of the NaOH solution? NaOH(aq) + HCI (Aq) rightarrow NaCI(aq) + H_2O(l) A) 0.953 M B) 0.051 M C) 0.035 M D) 0.686 M E) 1.05 M A system delivers 1275 J of heat while the surroundings perform 854J of work on it. What is delta U of the system? A) +421 J B) -421 J C) +2129 J D)-2129 J E)-1275 J Complete the sentence; When heat is transferred to the system, the process is said to be_________ and the sign of q is __________. A) exothermic, positive B) endothermic, negative C) exothermic, negative D) forbidden, indeterminate E) endothermic, positive An endothermic reaction causes the surroundings to A) become acidic. B) decrease in temperature. C) release CO_2. D) condense. E) warm up A system initially has an internal energy U of 504J. It undergoes a process during which it releases 111 J of heat energy to the surroundings, and does work of 222 J. What is the final energy of the system, in J? A) 837 J B) 504 J C) 615 J E) 393 J

Explanation / Answer

Ans 27 B 0.49 mol

HCl is a strong acid that completely ionises, which means there are same number of H+ ions as HCl.

the number of moles is given by the formula,

n ( number of moles) = c (concentration) x v ( volume in L )

n = 0.65 x 0.75

n = 0.4875

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