When zinc chloride (ZnCl2) reacts with NH3 solution, a white crystalline compound Zn(NH3)12Cl2 is produced. A student used the same procedure as the one you used to analyze Ni(NH3)12Cl2 to determine the mass percent of NH3 in Zn(NH3)12Cl2. The student added 25.00 ml of 0.2500 M HCI solution to an aqueous solution containing 0.3146 g of Zn(NH3)12Cl2. The excess HCI required 25.60 ml of 0.1000 M NaOH solution for complete titration. Calculate the mass percent of NH3 in Zn(NH3)12Cl2 based on the student's data.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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