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Determine the number of moles and the mass requested for each reaction in [link] .

(a) 0.0686 mol Mg, 1.67 g Mg; (b) 2.701 × 10 −3 mol O 2 , 0.08644 g O 2 ; (c) 6.43 mol MgCO 3 , 542 g MgCO 3 (d) 713 mol H 2 O, 12.8 kg H 2 O; (e) 16.31 mol BaO 2 , 2762 g BaO 2 ; (f) 0.207 mol C 2 H 4 , 5.81 g C 2 H 4

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H 2 is produced by the reaction of 118.5 mL of a 0.8775-M solution of H 3 PO 4 according to the following equation: 2 Cr + 2 H 3 PO 4 3 H 2 + 2 CrPO 4 .

(a) Outline the steps necessary to determine the number of moles and mass of H 2 .

(b) Perform the calculations outlined.

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Gallium chloride is formed by the reaction of 2.6 L of a 1.44 M solution of HCl according to the following equation: 2 Ga + 6 HCl 2 GaCl 3 + 3 H 2 .

(a) Outline the steps necessary to determine the number of moles and mass of gallium chloride.

(b) Perform the calculations outlined.

(a) volume HCl solution mol HCl mol GaCl 3 ; (b) 1.25 mol GaCl 3 , 2.2 × 10 2 g GaCl 3

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I 2 is produced by the reaction of 0.4235 mol of CuCl 2 according to the following equation: 2 CuCl 2 + 4 KI 2 CuI + 4 KCl + I 2 .

(a) How many molecules of I 2 are produced?

(b) What mass of I 2 is produced?

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Silver is often extracted from ores such as K[Ag(CN) 2 ] and then recovered by the reaction
2 K [ Ag ( CN ) 2 ] ( a q ) + Zn ( s ) 2Ag ( s ) + Zn ( CN ) 2 ( a q ) + 2 KCN ( a q )

(a) How many molecules of Zn(CN) 2 are produced by the reaction of 35.27 g of K[Ag(CN) 2 ]?

(b) What mass of Zn(CN) 2 is produced?

(a) 5.337 × 10 22 molecules; (b) 10.41 g Zn(CN) 2

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What mass of silver oxide, Ag 2 O, is required to produce 25.0 g of silver sulfadiazine, AgC 10 H 9 N 4 SO 2 , from the reaction of silver oxide and sulfadiazine?
2 C 10 H 10 N 4 SO 2 + Ag 2 O 2 AgC 10 H 9 N 4 SO 2 + H 2 O

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Carborundum is silicon carbide, SiC, a very hard material used as an abrasive on sandpaper and in other applications. It is prepared by the reaction of pure sand, SiO 2 , with carbon at high temperature. Carbon monoxide, CO, is the other product of this reaction. Write the balanced equation for the reaction, and calculate how much SiO 2 is required to produce 3.00 kg of SiC.

SiO 2 + 3 C SiC + 2 CO, 4.50 kg SiO 2

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Automotive air bags inflate when a sample of sodium azide, NaN 3 , is very rapidly decomposed.
2 NaN 3 ( s ) 2 Na ( s ) + 3 N 2 ( g )
What mass of sodium azide is required to produce 2.6 ft 3 (73.6 L) of nitrogen gas with a density of 1.25 g/L?

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Urea, CO(NH 2 ) 2 , is manufactured on a large scale for use in producing urea-formaldehyde plastics and as a fertilizer. What is the maximum mass of urea that can be manufactured from the CO 2 produced by combustion of 1.00 × 10 3 kg of carbon followed by the reaction?
CO 2 ( g ) + 2 NH 3 ( g ) CO ( NH 2 ) 2 ( s ) + H 2 O ( l )

5.00 × 10 3 kg

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In an accident, a solution containing 2.5 kg of nitric acid was spilled. Two kilograms of Na 2 CO 3 was quickly spread on the area and CO 2 was released by the reaction. Was sufficient Na 2 CO 3 used to neutralize all of the acid?

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A compact car gets 37.5 miles per gallon on the highway. If gasoline contains 84.2% carbon by mass and has a density of 0.8205 g/mL, determine the mass of carbon dioxide produced during a 500-mile trip (3.785 liters per gallon).

1.28 × 10 5 g CO 2

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What volume of 0.750 M hydrochloric acid solution can be prepared from the HCl produced by the reaction of 25.0 g of NaCl with excess sulfuric acid?
NaCl ( s ) + H 2 SO 4 ( l ) HCl ( g ) + NaHSO 4 ( s )

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What volume of a 0.2089 M KI solution contains enough KI to react exactly with the Cu(NO 3 ) 2 in 43.88 mL of a 0.3842 M solution of Cu(NO 3 ) 2 ?
2 Cu ( NO 3 ) 2 + 4 KI 2 CuI + I 2 + 4 KNO 3

161.40 mL KI solution

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A mordant is a substance that combines with a dye to produce a stable fixed color in a dyed fabric. Calcium acetate is used as a mordant. It is prepared by the reaction of acetic acid with calcium hydroxide.
2 CH 3 CO 2 H + Ca (OH) 2 Ca ( CH 3 CO 2 ) 2 + 2 H 2 O

What mass of Ca(OH) 2 is required to react with the acetic acid in 25.0 mL of a solution having a density of 1.065 g/mL and containing 58.0% acetic acid by mass?

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The toxic pigment called white lead, Pb 3 (OH) 2 (CO 3 ) 2 , has been replaced in white paints by rutile, TiO 2 . How much rutile (g) can be prepared from 379 g of an ore that contains 88.3% ilmenite (FeTiO 3 ) by mass?
2 FeTiO 3 + 4 HCl + Cl 2 2 FeCl 3 + 2 TiO 2 + 2 H 2 O

176 g TiO 2

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Source:  OpenStax, Ut austin - principles of chemistry. OpenStax CNX. Mar 31, 2016 Download for free at http://legacy.cnx.org/content/col11830/1.13
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