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문제 108c,d
Write the balanced chemical equation for each reaction.
c. Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas.
d. Gaseous ammonia (NH3) reacts with gaseous oxygen to form gaseous nitrogen monoxide and gaseous water.
- Write the balanced chemical equation for the reaction between aqueous sodium carbonate and aqueous copper(II) chloride to form solid copper(II) carbonate and aqueous sodium chloride.
문제 109
문제 110
Write the balanced chemical equation for the reaction of aqueous potassium hydroxide with aqueous iron(III) chloride to form solid iron(III) hydroxide and aqueous potassium chloride.
문제 111
Balance each chemical equation. b. Co(NO3)3(aq) + (NH4)2S(aq) → Co2S3(s) + NH4NO3(aq)
문제 112
Balance each chemical equation. a. Na2S(aq) + Cu(NO3)2(aq) → NaNO3(aq) + CuS(s) b. N2H4(l) → NH3(g) + N2(g) c. HCl(aq) + O2(g) → H2O(l) + Cl2(g) d. FeS(s) + HCl(aq) → FeCl2(aq) + H2S(g)
- Classify each compound as organic or inorganic: a. CaCO3 b. C4H8 c. C4H6O6 d. LiF
문제 113
- Classify each compound as organic or inorganic: a. C8H18 b. CH3NH2 c. CaO d. FeCO3
문제 114
문제 115
Classify each hydrocarbon as an alkane, alkene, or alkyne. a. H2C=CH−CH3 b. H3C−CH2−CH3 c. HC≡C−CH3 d. H3C−CH2−CH2−CH3
문제 116
Classify each hydrocarbon as an alkane, alkene, or alkyne. a. HC≡CH
- Write the formula based on the name, or the name based on the formula, for each hydrocarbon. a. propane b. CH3CH2CH3 c. CH3CH2CH2CH2CH3 d. octane
문제 117
- Write the formula based on the name, or the name based on the formula, for each hydrocarbon: a. CH3CH3 b. pentane c. CH3CH2CH2CH2CH2CH3 d. heptane.
문제 118
- Classify each organic compound as a hydrocarbon or a functionalized hydrocarbon. For functionalized hydrocarbons, identify the compound’s family. a. H3C-CH2OH
문제 119
문제 121
How many molecules of ethanol (C2H5OH) (the alcohol in alcoholic beverages) are present in 145 mL of ethanol? The density of ethanol is 0.789 g/cm3.
문제 122
A drop of water has a volume of approximately 0.05 mL. How many water molecules does it contain? The density of water is 1.0 g/cm3.
문제 123a,b
Determine the chemical formula of each compound and then use it to calculate the mass percent composition of each constituent element. a. potassium chromate b. lead(II) phosphate
문제 123c
Determine the chemical formula of each compound and then use it to calculate the mass percent composition of each constituent element. c. sulfurous acid
문제 123d
Determine the chemical formula of each compound and then use it to calculate the mass percent composition of each constituent element. d. cobalt(II) bromide
문제 124
Determine the chemical formula of each compound and then use it to calculate the mass percent composition of each constituent element. c. nitrogen triiodide
문제 125
A Freon leak in the air-conditioning system of an old car releases 25 g of CF2Cl2 per month. What mass of chlorine does this car emit into the atmosphere each year?
- A Freon leak in the air-conditioning system of a large building releases 12 kg of CHF2Cl per month. If the leak is allowed to continue, how many kilograms of Cl will be emitted into the atmosphere each year?
문제 126
문제 127
A metal (M) forms a compound with the formula MCl3. If the compound contains 65.57% Cl by mass, what is the identity of the metal?
문제 128
A metal (M) forms an oxide with the formula M2O. If the oxide contains 16.99% O by mass, what is the identity of the metal?
- Estradiol is a female sexual hormone that is responsible for the maturation and maintenance of the female reproductive system. Elemental analysis of estradiol gives the following mass percent composition: C 79.37%, H 8.88%, O 11.75%. The molar mass of estradiol is 272.37 g/mol. Find the molecular formula of estradiol.
문제 129
문제 130
Fructose is a common sugar found in fruit. Elemental analysis of fructose gives the following mass percent composition: C 40.00%, H 6.72%, O 53.28%. The molar mass of fructose is 180.16 g/mol. Find the molecular formula of fructose.
문제 131
Combustion analysis of a 13.42-g sample of equilin (which contains only carbon, hydrogen, and oxygen) produces 39.61 g CO2 and 9.01 g H2O. The molar mass of equilin is 268.34 g/mol. Find its molecular formula.
문제 132
Estrone, which contains only carbon, hydrogen, and oxygen, is a female sexual hormone in the urine of pregnant women. Combustion analysis of a 1.893-g sample of estrone produces 5.545 g of CO2 and 1.388 g H2O. The molar mass of estrone is 270.36 g/mol. Find its molecular formula.
문제 133
Epsom salts is a hydrated ionic compound with the following formula: MgSO4 • x H2O. A 4.93-g sample of Epsom salts is heated to drive off the water of hydration. The mass of the sample after complete dehydration is 2.41 g. Find the number of waters of hydration (x) in Epsom salts.
문제 134
A hydrate of copper(II) chloride has the following formula: CuCl2 • x H2O. The water in a 3.41-g sample of the hydrate is driven off by heating. The remaining sample has a mass of 2.69 g. Find the number of waters of hydration (x) in the hydrate.
문제 135
A compound of molar mass 177 g/mol contains only carbon, hydrogen, bromine, and oxygen. Analysis reveals that the compound contains eight times as much carbon as hydrogen by mass. Find the molecular formula.
문제 136
Researchers obtained the following data from experiments to find the molecular formula of benzocaine, a local anesthetic, which contains only carbon, hydrogen, nitrogen, and oxygen. Complete combustion of a 3.54-g sample of benzocaine with excess O2 forms 8.49 g of CO2 and 2.14 g H2O. Another 2.35-g sample contains 0.199 g of N. The molar mass of benzocaine is 165 g/mol. Find the molar formula of benzocaine.