What is the gravitational force of attraction for two protons  separated by 75 pm?

For the chemical reaction   2HBr(aq)+Ba(OH)2(aq)⟶2H2O(l)+BaBr2(aq)2HBr(aq)+Ba(OH)2⁢(aq)⟶2⁢H2O(l)+BaBr2⁢(aq)   write the net ionic equation, including the phases.

(Q67) What is the freezing point of a solution made from 644.6 grams of benzene to which 45.7 grams of the nonelectrolyte cycloheptene (C7H12) has been added? (Report freezing temperature to the hundredths place - two decimal places)

Complete and balance the following equations. Na2O2 (s) + H₂O(1) → Express your answer as a chemical equation including phases. ΑΣΦ ? A chemical reaction does not occur for this question.

(Q66) At what temperature (°C) will a solution that contains 78.1 grams of the nonelectrolyte ethylene glycol (C2H6O2) that has been added to a mass of 673 grams of pure water boil? The normal boiling point of water is 100.00°C. (Report boiling temperature to the hundredths place - two decimal places)

Sodium chloride (NaCl) was isolated from SiO2 and CaCO3 by dissolving it in distilled water. Unmentioned is that CaCO3 is slightly soluble in water (0.001 g/100 mL). Describe the effect this fact will have on each component of the mixture: will the “isolated“ mass of each be greater than, equal to, or less than that in the sample?