21.2 g of sodium carbonate (Na2CO3) is dissolved in water and made up to 250mL: (1) How many moles of sodium carbonate are contained in 21.2 g and what is the molarity of the solution? (ii) Write the balanced equation for the reaction of sodium carbonate with hydrochloric acid. (iii) What volume of 0.100 M hydrochloric acid would be needed to react completely with all of the sodium carbonate in the solution made above? (iv) What volume of carbon dioxide is produced when 21.2 g of sodium carbonate is reacted with excess hydrochloric acid at STP? (Given: 1 mole of ideal gas occupies 22.4 L at STP)