Calculate the % by mass concentration of sucrose (table sugar), C_12H_22O_11, in

Question

Calculate the % by mass concentration of sucrose (table sugar), C_12H_22O_11, in a solution made by dissolving 7.6 g of sucrose in 83.4 g of water. 1C. Calculate the molarity of a solution made by dissolving 3.0 g of CaCl_2 in enough water to make 300 mL of solution. 2. Balance the following reactions: a) AlCl_3 + K_2SO_3 rightarrow Al_2(SO_3)_3 + KCl b) Cu + H_3PO_4 rightarrow Cu_3(PO_4)_2 + H_2 c) C_4H_10 + O_2 rightarrow CO_2 + H_2O d) NaCLO_3 rightarrow NaCl + O_2 3A. The equation for the formation of nitrogen monoxide is N_2 + O_2 + heat rightarrow 2NO a) Is the formation of NO an endothermic or exothermic reaction? b) Is the energy of the product higher or lower than the energy of the reactants?

Explanation / Answer

1B)

% mass = mass of sucrose / total mass * 100%

mass of sucrose = 7.6

mass of water = 83.4

totl mass = 83.4+7.6 = 91

then

% mass = 7.6/91*100 = 8.3516 % of sucrose by mass

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