Question 13 (9 points) Calculate the change in freezing point and boiling point if 5.75 gof NH_(4)NO_(3) is dissolved in 47.0 g of chloroform. Assume 100% dissociation of NH_(4)NO_(3) The molar mass of NH_(4)NO_(3) is 80.043g/mol The K_(f) and K_(b) for chloroform are 8.10^circ C/m and 5.24^circ C/m respectively.

Give the balanced chemical equation for decomposition of hydrogen peroxide to water and oxygen. H_(2)O_(2)(l)arrow H_(2)O(l)+O_(2)(g) 2H_(2)O_(2)(l)arrow 12H_(2)O(l)+O_(2)(g) H_(2)O(l)+O_(2)(g)arrow H_(2)O_(2)(l) 2H_(2)O(l)+O_(2)(g)arrow 12H_(2)O_(2)(l)

If heat is added to a solid, the temperature of the solid does not change while it is melting. How can the temperature behave in this manner during the endothermic phase change? Adding heat increases temperature. Subtracting heat from surroundings makes them colder. The heat added goes toward overcoming the intermolecular forces in the substance.

The molecule that is polar and acts like a base is R-OH R-PO_(4) R-NH_(2) R-SH R-CO-R

Why is it beneficial to know and use the lowest effective concentration of an antimicrobial chemical?

Select all that apply. Water is non cohesive is a relatively poor solvent. is nonpolar. has a high heat of vaporization. evaporates and increases body temperature.

A gas occupies 667.9 mL at a temperature of 26.4^circ C What is the volume of gas at 122.87^circ C assuming pressure did not change? Give your answer in L to the hundredths place. Do not put units in the answer space.

Consider the following compounds. Which is insoluble? VI_(2) HgBr_(2) ONaBr NaCl All of these None of these

Which of these reactions forms a precipitate as a product? AlPO_(4)+3LiBrarrow ?? FeCl_(2)+BeSarrow ?? NaOH+NH_(4)ClO_(3)arrow ?? K_(2)CO_(3)+2CsCH_(3)COOarrow ??

How many oxygen atoms are found in a 33 g sample of manganese(III)nitrite? A. 2.06times 10^23 0 atoms 8 7 25 N Mn 16.00 14.01 54.94 B. 4.57times 10^23 0 atoms C. 5.10times 10^23 0 atoms D. 6.18times 10^23 O atoms E. . 7.42times 10^23 0 atoms

Hot Questions

Hydrogen sulfide is: A) Odorless B) Colorless C) Not flammable D) Red in color

Question 21 Calculate $\Delta _{r}G^{\circ }$ at $25.0^{\circ }C$ for the reaction below. $2Na(s)+2H_{2}O(l)\rightarrow 2NaOH(aq)+H_{2}(g)$ Given: $\Delta _{r}H^{\circ }=-314kJ$ and $\Delta _{r}S^{\circ }=-117J/K$ (Report your answer in units of kJ, to one decimal place, i.e xxx.x, and no units are necessary in the answer.) (Remember to include a negative sign, if necessary.)

Which type of reaction is represented by the generic equation $AB+CD\rightarrow AD+CB$ combustion decomposition single replacement double replacement

Given the equilibrium constants for the following reactions: $4Cu(s)+O_{2}(g)\rightleftharpoons 2Cu_{2}O(s),K_{1}=6.19$ $4CuO(s)\rightleftharpoons 2Cu_{2}O(s)+O_{2}(g),K_{2}=0.16$ what is K for the system $2Cu(s)+O_{2}(g)\rightleftharpoons 2CuO(s)$ equivalent to? (Report your answer to four decimal places, i.e.xxxx) $\square $

What is the pH of a solution made by combining 0.484 m $NaC_{2}H_{3}O_{2}$ with 0.042 M $HC_{2}H_{3}O_{2}$ ? The $K_{a}$ of acetic acid is $1.75\times 10^{-5}$ (Report your answer to three decimal places, i.e x.xxx)

As pure molecular solids , identify the types of intermolecular forces in each: $PH_{3}$ $\square $ HF $\square $ $CO_{2}$ $\square $

What is the molality of ethanol $(C_{2}H_{5}OH)$ in an aqueous solution that is $48.2\% $ ethanol by mass? (Report your answer to two decimal places, i.e xx.xx, and no units are necessary in the answer.)

What is the molality of ethanol $(C_{2}H_{5}OH)$ in an aqueous solution that is $48.2\% $ ethanol by mass? (Report your answer to two decimal places, ite xxxx, and no units are necessary in the answer.)

Continue to shake until no more salt will come out of the shaker. What happens to the last several crystals of salt that come out? The sodium ions dissolve while the chloride ions sink to the bottom. The salt crystals react with the water to form a new compound. All of the ions separate from each other and dissolve into the water. The salt crystals don't dissolve in the water and fall to the bottom unchanged.

Consider the reaction of magnesium silicide with water shown below: $Mg_{2}Si(s)+4H_{2}O(l)\rightarrow 2Mg(OH)_{2}(aq)+SiH_{4}(g)$ In the reaction of 13.13 g $Mg_{2}Si$ with excess water, 16.03 g $Mg(OH)_{2}$ were produced. Calculate the percent yield of $Mg(OH)_{2}$ Enter the answer rounded to 2 decimal places.Units are not necessary. Answer: $\square $