What type of reaction are these?

1) 2 MgI₂ + Mn(SO₃)₂ → 2 MgSO₃ +MnI₄

2) P₄ + 3 O₂ → 2 P₂O₃

3) SeCl₆ + O₂ → SeO₂ + 3 Cl₂

4) C₃H₆O + 4 O₂ → 3 CO₂ + 3 H₂O

Calculate the h3o+ concentration in a solution of acetic acid if the concentration of molecular acetic acid present at equilibrium is 9.97x10^-3 m and k for the dissociation is 1.86x10^-5. ch3cooh(aq)+h2o(> h3o^+(aq)+ch3coo^-(aq)

Which characteristics can be used to differentiate star systems? check all that apply.

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.