Cobalt(II) chloride forms several hydrates with the general formula CoCl2 ·x H2O , where  x  is an integer. If the hydrate is heated, the water can be driven off, leaving pure  CoCl2  behind.   Suppose a sample of a certain hydrate is heated until all the water is removed, and it's found that the mass of the sample decreases by 22.% . Which hydrate is it? That is, what is  x

Q: A 125.6 mg sample of an organic compound containing only carbon, hydrogen, and nitrogen is combusted…

A: Answer The empirical formula is C3H8N The molecular formula is C6H16N2

Q: 20. In Figure P3.6, the red spheres represent oxygen, black represent carbon, blue represent…

A: #P.3.6: Red spheres represent O atoms. Black spheres represent C atoms. Blue spheres represent N…

Q: A particular protein sample is found to have 1 atom of iron in its chemical formula. If the mass…

A: Mass percent expresses the solute concentration in any mixture. The division of weight of dissolved…

Q: magnesium sulfate, MgSO4 ⋅ xH2O. When 6.499 g of Epsom salts are dehydrated by heating, 3.173 g…

A: Hydrated epsom salt = 6.499 g Dehydrated Epsom salt = 3.173 g Mass percent of water = ?

Q: 3.142 One of the reactions that occurs in a blast furnace,where iron ore is converted to cast iron,…

A: From given data  Mass of original sample (Fe2O3) = 2.62×103 Mass of Fe = 1.64×103 Also Mass of Fe…

Q: Part 1: Calculate the mass percentage of N in N2O4. Report your answer to 3 significant figures.…

A:

Q: Mg(s) + 2 HCl(aq) −−−→ MgCl2aq) + H2(g)   given that the mass of magnesium is 0.030 g, find the…

A:

Q: A certain gasoline additive that boosts the octane rating of gasoline is made of the elements C, H,…

A:

Q: Phosgene, a substance used in poisonous gas warfare during World War I, is so named because it was…

A:

Q: Tetrasilane (Si4H10) is a liquid with a density of 0.825 g cm-3 . It reacts with oxygen to give…

A: First calculate the mass of tetrasilane. Convert the above calculated mass to moles.

Q: A sample of pure alumina hydrate was obtained from a bag of flame retardant. A 5.000 g sample of the…

A: Weight of the hydrated aluminum oxide (Al2O3 . xH2O) = 5.000 g Weight of the anhydrous alumina (when…

Q: An organic compound has an empirical formula CH2 and a molar mass of 112.21 g/mol. How many H atoms…

A: an empirical formula CH2  empirical mass = (12 x 1 ) + (1 x 2)= 14  n = molar mass / empirical mass…

Q: 0.93 g sample of NaCr(SO4)2.XH20 was heated in a crucible to get a constant mass. If the mass of the…

A: Molar mass of NaCr(SO4)2.xH2O = 0.93 g = AMass of NaCr(SO4)2= 0.70g = BMolar mass ofNaCr(SO4)2 =…

Q: The smell of a burning match is due to the formation of sulfur oxides. We can represent the relevant…

A: The given reaction is: S+O2→SO2......(1) The mass of sulfur burned is 4.8 g.

Q: A 6.7283 g sample of a hydrate of MgSO4 was heated to drive off all of the water of hydration. The…

A: The first step is to calculate the mass of water that was lost when the hydrate was heated. This can…

Q: Suppose you isolate an acid from clover leaves and know that it contains only the elements C, H, and…

A:

Q: A 1.42 g sample of KCr(SO) XH20 was heated in a crucible to get a constant mass. The mass of the…

A: Formula to calculate mole is :-  Mole = mass÷ molar mass

Q: An organic compound consists of carbon, hydrogen and sulfur only. The percentage of carbon by mass…

A: For calculation of Molecular formula, first of all we calculate the % of each atom , empirical…

Q: un o 8u described in this laboratory. After heating, the sample is found to weigh 2.245 grams. How…

A:

Q: [Referencen) Hexamethylenediamine (C.H16 N2) is one of the starting materials for the production of…

A: Percent Yield: To compute the percent yield, it is first necessary to determine how much of the…

Q: PCL5(s) + H2O(l) ----> POCl3(l) + 2HCl(aq) When 79.60 g of phosphorus pentachloride reacts with…

A:

Q: A mixture was found to contain 1.50g NH4CI, 0.80 g NaCI, and 1.20 g SiO2. What is the percentage of…

A: Given: Mass of NH4Cl = 1.50 g Mass of NaCl = 0.80 g Mass of SiO2 = 1.20 g

Q: the mineral gibbsite has the formula al(oh)3. what mass in,in kg, of al is present in 2.9 kg of…

A: Given, mass of gibbsite,  Al(OH)3  = 2.9 kg = 2900 g Thus, moles of gibbsite can be calculated as,…

Q: A student obtains a mixture of the chlorides of two unknown metals, X and Z. The percent by mass of…

A: Given: Mixture of metal X and Z. And mass percent of X and Z in the mixture.

Q: How many moles of Al are necessary to form 83.0 g of AIBR, from this reaction: 2 Al(s) + 3 Br,(1) →…

A: For the reaction: 2Al     +   3Br2 →  2AlBr3 2 mol        3 mol         2 mol Given : Mass of AlBr3…

Q: For the chemical reaction 2KI+Pb(NO3)2-->PbI2+2KNO3 what mass of lead (ii) is produced from 1.13…

A: Given: Moles of KI = 1.13 g Molar mass of PbI2 = 461.01 g/mol

Q: An unknown mass of NasPO4(s) is dissolved in water to form 50.00 mL of solution. This is Solution A.…

A: Let the mass of Na3PO4 dissolved = X gm Molar mass of Na3PO4 = 163.94 gm Number of moles of Na3PO4 =…

Q: Quartz, SiO2, contains 46.7% silicon. What mass of silicon is present in 370 g of quartz?

A: To solve this problem we have to calculate the mass of silicon present in quartz .

Q: Carborundum (silicon carbide), SiC, is a very hard material used as an abrasive on sandpaper and in…

A:

Q: A binary compound of the elements X and Y is 1/3X by mass.  The molar mass of element X is ¾ the…

A: Empirical Formula  It is the simplest possible ratio of atoms present in a compound. To get the…

Q: A candle flame produces easily seen specks of soot near the edges of the flame, especially when the…

A: Empirical formula: The simplest positive integer ratio of atoms present in a compound is known as…

Q: Hydrothermal vents produce many types of compounds. One such compound consists of the elements…

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Q: If there were 4.00 x 10^23 sodium ions available, (and more than enough carbonate ions), how many…

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Q: (Mass of crucible is 24.98g. The mass of the cover is 11.36g. The mass of the crucible, cover, and…

A: The mass % is equal to the ratio of the mass of the substance to the total mass multiplied by 100.…

Q: Potassium alum or potassium aluminum sulfate dodecahydrate KAl(SO4)2.12H2O is a hydrate which means…

A:

Q: Assume 100% yield. a) 10.0 g of copper sulfate are formed. b) H2SO4 is the limiting reagent. c)…

A:

Q: Imagine that you are given 0.2500 g of a sample of copper(II) sulfate pentahydrate (CuSO4 • 5 H2O).…

A: The mass of copper(II) sulfate pentahydrate (CuSO4 • 5 H2O) sample is = 0.2500 g The mass of…

Q: 0.93 g sample of NaCr(SO4)2.XH20 was heated in a crucible to get a constant mass. If the mass of the…

A: In this question, we want to determine the value of x in the given Compound. How we will determine,…

Q: Determine the number of moles in: (a) 100 grams of magnesium hydroxide (Mg=24, O= 16, H=1) (b)1.75 x…

A: Mole concept: The number of molecules or atoms present in the one mole of the substance is equal to…

Q: Benzene (C6H6) is a liquid with a density of 0.874 g cm-3. It reacts with oxygen to give carbon…

A: Given: Volume of benzene reacted = 21.3 cm3 Density of benzene = 0.874 g cm-3 We have to calculate…

Q: The semi-precious stone turquoise is a hydrate and with the chemical formula CuAl6(PO4)+(OH):"4 H2O.…

A: Interpretation : Following questions need to be solved .

Q: he doesn't have time to repeat the steps of heating, cooling crucibles, and remeasuring the mass.…

A: Amount of water in a hydrate is calculated by using the formula  Amount of water in a hydrated salt…

Q: What mass of lime, CaO, can be obtained by heating 105 kg of limestone that is 93.0% by mass CaCO₂?…

A:

Q: Silicon tetrachloride (SiCl4 ) can be prepared by heating Si in chlorine gas:  Si(s) + 2Cl2(g) ->…

A: Molar mass of Cl2 = 70.9 g/mol

Q: 3N2 (g) + H2(g) ~> 2NH3(g) is the balanced chemical equation for the synthesis of ammonia. If an…

A: Given balanced chemical equation for the synthesis of ammonia is  3N2 + H2 ----> 2NH3 Starting…

Q: Benzene (C6H6) is a liquid with a density of 0.874 g cm-3. It reacts with oxygen to give carbon…

A: Density of Benzene = 0.874 g cm-3 Volume of Benzene = 21.3 cm3

Q: A compound containing hydrogen, H; boron, B; and oxygen, O, is analyzed and found to be 3.90%…

A: The empirical formula of a chemical compound is the simplest whole-number ratio of the atoms in the…

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".