Gold reacts with the elements in Group 7 of the periodic table.0.175 g of gold reacts with chlorine. The equation for the reaction is:2 Au + 3 Cl2→ 2 AuCl3 Calculate the mass of chlorine needed to react with 0.175 g of gold. Give your answer in mgRelative atomic masses (Ar): Cl = 35.5 Au = 197 [5 marks]Mass of chlorine=mgTurn over for the next question

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ