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6,230 solutions

Freezing Point Depression

Q. Evaluate the following statement as true or false: The freezing point of a 0.15m MgCl2(aq) should theoretically be lower than the freezing point of a 0.25 m KI(aq). Explain your reasoning.

Solved • Sep 16, 2019

Mass Percent

Q. 9. What is the percent composition by mass (to one decimal place) of oxygen and hydrogen in 1 mol of water?

Solved • Sep 13, 2019

Subatomic Particles

Q. Fill in the blanks to complete the following table. Symbol Ion formed Number of electrons in ion Number of protons in ion F _____ _____ 9 S _____ 18 _____ Br Br− _____ _____ _____ Sr2+ _____ 38

Solved • Sep 16, 2019

ICE Chart

Q. Calculate the molarity of Cl2. Round to the two decimal place. Please use #x^2 #x #

Solved • Sep 16, 2019

Le Chatelier's Principle

Q. Nitrogen and hydrogen react to form ammonia, like this: N2(g) + 3H2(g)-->2NH3 (g) The reaction is exothermic. Suppose a mixture of N2, H2, and NH3 has come to equilibrium in a closed reaction vessel. Predict what change, if any, the perturbations below will cause in the composition of the vessel. Also decide whether the equilibrium shifts to the right or left. (a) The temperature is lowered. The pressure of H2 will _________________. (b) The temperature is raised. The pressure of NH3 will _________________.

Solved • Sep 16, 2019

Empirical Formula

Q. 8. A compound was found to contain 115.49 g of Ca, 92.16 g of O, and 5.82 g of H. What is the total mass (in g) of the compound? What is the empirical formula of the compound?

Solved • Sep 13, 2019

Le Chatelier's Principle

Q. In the table below predict what change will cause in the composition of the mixture in the vessel.

Solved • Sep 16, 2019