According to the following thermochemical equation, what mass of h2o (in g) must form in order to produce 3900 kj of energy?
sio2(s) + 4 hf(g) → sif4(g) + 2 h2o(l) δh°rxn = -184 kj sio2(s) + 4 hf(g) → sif4(g) + 2 h2o(l) δh°rxn = -184 kj 216 g 382 g 763 g 408 g 272 g

763 g

Explanation:

Let's consider the following thermochemical equation.

SiO₂(s) + 4 HF(g) → SiF₄(g) + 2 H₂O(l)    ΔH°rxn = -184 kJ

From the enthalpy of the reaction (ΔH°rxn), we can affirm that 184 kJ are released when 2 moles of H₂O(l) are produced. Taking into account that the molar mass of H₂O is 18.01 g/mol, the mass of water formed to produce 3900 kJ of energy is:

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

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