for the the reaction. A given below, calculate AH rXKn in kJ, for the following

Question

for the the reaction. A given below, calculate AH rXKn in kJ, for the following reaction formation Report your answer to two decimal places in standard notation 2Cr203(s) 3Si(s) ACr(s) 3SiO2(g) Cr203 (s): -1134.70 kJ/mol Si (s): 0.00 kJ/mol Cr (s): 0.00 kJ/mol 1353.11 kJ You are correct. Previous Tries Your receipt no. s 160-9188 (2 2. Calculate the amount of heat absorbed/released (in kJ) when 12.97 grams of Cr are produced via the above reaction Report your answer to two decimal places, and use appropriate signs to indicate heat flow direction. 0 kJ Sub mit Answer Incorrect Tries 1/3 Previous Tries

Explanation / Answer

from reaction ,
when 4 moles of Cr is produced, heat absorbed = 1353.11 KJ

Molar mass of Cr= 52 g/mol
mass of Cr= 12.97 g
number of moles of Cr = mass / molar mass
                                               = 12.97/52
                                               = 0.249 mol

When 0.249 mol of Cr is produced, heat absorbed = 1353.11 * 0.249 / 4
                                                                                                        = 84.37 KJ
Answer: 84.37 KJ

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