10. (TCO 4) DeShawn has made 0.250 L of a 3.0 M solution of BaSO How many moles

Question

10. (TCO 4) DeShawn has made 0.250 L of a 3.0 M solution of BaSO How many moles of BasO4 are present? (Points 2) o 1.3 moles o 83 moles O 3.0 moles 0.75 mole o 750 moles 11. (TCO 3) Barium chloride and potassium carbonate combine to form barium carbonate and potassium chloride. The equation for this chemical reaction is shown below. BaCl2 K2CO3 BaCO3 KC Classify the reaction as combination, decomposition, single replacement, or double replacement. (2 points) ls the equation balanced? If not, balance it. (4 points) If 2 moles of Bacl2 reacted completely, how many moles of KCl would be produced? How many grams of KCl would be produced? (4 points) (Points 10 Spellchecker

Explanation / Answer

10 ) Moles = M x V = 3 x 0.25 = 0.75   ( Molarity given 3M , volume is 0.25liters)

Hence moles of BaSO4 = 0.75

11) BaCl2 + K2CO3 ---> BaCO3 + KCl

reaction is double displacement since anions Cl- and CO32- are exchanged between cations.

Reaction is not balanced , balanced reaction is

BaCl2 + K2CO3 --> BaCO3 + 2KCl

1 BaCl2 gives 2KCl , hence 2 moles BaCl2 completely react to give 2 x 2 = 4 moles KCl

KCl mass in grams = moles of KCl x molar mass of KCl = 4mol x 74.5513 g/mol = 298.2 grams

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