Which combination will produce a precipitate? NaOH (aq) and HCl (aq) NaCl (aq) a

Question

Which combination will produce a precipitate? NaOH (aq) and HCl (aq) NaCl (aq) and HC_2H_3O_2 (aq) NaOH (aq) and Fe(NO_3)_2 (aq) NH_4NO_3 (aq) and CaCl_2 (aq) None of the above The combustion of propane produces heat according to the following reaction C_3H_8 (g) + 5 O_2(g) 3 CO_2 (g) + 4 H_2 O(l) Delta H degree _rxn = -2220 kJ How many moles of propane are required to barbecue a whole chicken knowing that a fully cooked chicken requires 35.8 kJ of heat. 3.22 times 10^-2 22.2 1.61 times 10^-2 22.2 31.0

Explanation / Answer

Q26) Average atomic mass = mass of 31 isotope * percentage of 31 isotope + mass of 34 isotope * percentage of 34 isotope

=> 31.16 * 0.3516 + 34.30 * 0.6484

=> 33.195

Hence correct answer is Option A

Q27) correct answer is Option C

It will form the precipitate of Fe(OH)2 which is green in color

Q28) For one mole of propane, heat produced is equal to 2220 KJ

Number of moles of Propane required to barbqeque chicken = heat required/ heat released by one mole of propane on combustion

=> 35.8/2220

=> 1.61 * 10^(-2) moles

Hence correct answer is Option C

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