55. Use data from Appendix IIB to calculate ASxn for each of the reactions. In each case, try to rationalize the sign of ASx a. C2H4(3) + H2(g) →→ CH68) b. C(s) + H2O(g) — CO(g) + H2(g) c. CO(g) + H2O(g) — H2() + CO2(8) d. 2 H,S(g) + 3 02(g) 2 H2O(l) + 2 SO2()

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Keith LeannonLv2

30 Nov 2017

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56. Use data from Appendix IIB to calculate ASixn for each of the reactions. In each case, try to rationalize the sign of ASPxn a. 3 NO2(g) + H2O(1) - 2 HNO3(aq) + NO(g) b. Cr2O3(s) + 3 CO(g) – 2 Cr(s) + 3 CO2(g) c. SO2(g) + O2(g) →→ SO3(g) d. N204(8) + 4H2(g) → N2(g) + 4H2O(g)

Fill in the nine gaps in this table.
Symbol B
Protons 19
Neutrons 20
Electrons 18
Mass number 11 40

Identify the unknown particle (X) in the following equations fornuclear decay, and state whether each process is alpha decay, betadecay, or gamma decay. (Type your answer according to this format:4 2 He represents . Use gamma to enter ?.)
(a) ? X + -
X =

(b) ? + X
X =

(c) ? + X
X =

Actinium-225 () undergoes alpha decay.
(a) Write the equation. (Enter the mass number in the first raisedbox, the atomic number in the second lower box, and the element,with charge if necessary, in the third box.)
? + He

(b) The daughter formed in part (a) undergoes beta decay. Write theequation. (Enter the mass number in the first raised box, theatomic number in the second lower box, and the element, with chargeif necessary, in the third box.)
? + e

Classify each of the following materials as an element, compound,heterogeneous mixture, or homogeneous mixture.
(a) concrete
element
compound
heterogeneous mixture
homogeneous mixture

(b) clear apple juice
element
compound
heterogeneous mixture
homogeneous mixture

(c) nitrogen
element
compound
heterogeneous mixture
homogeneous mixture

(d) ozone
element
compound
heterogeneous mixture
homogeneous mixture

Refer to the figure below. Find the approximate solubility (g/100 gwater) of sugar at 20Â°C.
g/100 g of water

Give the symbol for each of the following elements.
(a) lead

(b) sodium

(c) oxygen

Give the name of each element.
(a) Cu

(b) Bi

(c) Ti

Volcanoes emit much hydrogen sulfide gas, H2S, which reacts withthe oxygen in the air to form water and sulfur dioxide, SO2. Every53 tons of H2S reacts with 75 tons of oxygen and forms 28 tons ofwater. How many tons of SO2 are formed?

An antacid tablet weighing 0.939 g contained calcium carbonate asthe active ingredient, in addition to an inert binder. When an acidsolution weighing 56.233 g was added to the tablet, carbon dioxidegas was released, producing a fizz. The resulting solution weighed56.954 g. How many grams of carbon dioxide were produced?

Calculate (to the nearest 0.1 u) the formula mass of thesecompounds.
(a) sodium phosphate, Na3PO4
u

(b) methane, CH4
u

(c) silver cyanide, AgCN
u

Calculate (to the nearest 0.1 u) the formula mass of thesecompounds.
(a) silver carbonate, Ag2CO3
u

(b) calcium bromide, CaBr2
u

(c) magnesium hydroxide, MgOH
u

Balance these chemical equations. (Use the lowest possiblecoefficients.)
(a) O2 + N2H4 ? H2O2 + N2

(b) Sr + H2O ? Sr(OH)2 + H2

(c) NH3 + O2 ? N2 + H2O

(d) Al + Fe3O4 ? Al2O3 + Fe

(e) Fe(OH)2 + O2 + H2O ? Fe(OH)3

(f) Pb(NO3)2 ? PbO + NO2 + O2

(a) Calcium and chlorine react to give calcium chloride in acombination reaction. Write and balance the equation. (Type youranswer using the format CO2 for CO2. Use the lowest possiblecoefficients.)

Ca + ?

(b) Heating decomposes Na2CO3 to sodium oxide and carbon dioxide.Write and balance the equation. Type your answer using the formatCO2 for CO2. Use the lowest possible coefficients.)

Na2CO3 ? + CO2

Write and balance the reaction for the complete combustion ofmethanol, CH3OH. (Type your answer using the format CO2 for CO2.Use the lowest possible coefficients.)

A 16.4-L tank of carbon dioxide gas (CO2) is at a pressure of 8.30105 Pa and temperature of 17.6Â°C.
(a) Calculate the temperature of the gas in Kelvin.
1 K

(b) Use the ideal gas law to calculate the number of moles of gasin the tank.
2 mol

(c) Use the periodic table to compute the molecular weight ofcarbon dioxide, expressing it in grams per mole.
3 g/mol

(d) Obtain the number of grams of carbon dioxide in the tank.
4 g

(e) A fire breaks out, raising the ambient temperature by 224.0 Kwhile 82.0 g of gas leak out of the tank. Calculate the newtemperature and the number of moles of gas remaining in thetank.
temperature 5 K
number of moles 6 mol

(f) Using a technique analogous to that in Example 10.6b, find asymbolic expression for the final pressure, neglecting the changein volume of the tank. (Use n_i for ni, the initial number ofmoles, n_f for nf, the final number of moles, T_i for Ti, theinitial temperature, T_f for Tf, the final temperature, and P_i,for Pi, the initial pressure as appropriate.)
7

(g) Calculate the final pressure in the tank as a result of thefire and leakage.
8 Pa