Consider a sample of calcium carbonate, CaCO3 (100.09 g/mol), in the form of a cube measuring 2.88. cm on each edge.  If the sample has a density of 2.83 g/cm3, how many moles of oxygen atoms does it contain?

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: A sample of limestone and other soil materials was heated, and the limestone decomposed to give…

A: Given -> CaCO3(s) -----> CaO(s) + CO2(g)  Weight of sample = 2.237 gm  Weight of CO2 formed =…

Q: Mercury can be obtained by reacting mercury(II) sulfide, HgS, with calcium oxide, CaO. How many…

A: Given: The reaction is as follows:  4CaO+4HgS→4Hg+3CaS+CaSO4 The mass of Hg produced=84.7 g. The…

Q: A molecule has the formula Na₂SOx, where X is a number of oxygen atoms. If the molar mass of the…

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

Q: How to calculate mass (in grams) of one formula unit of 13.0 g of Ca(NO3)2?

A:

Q: Caffeine, a stimulant of the central nervous system, has the molecular formula C8H₁0N4O2. The molar…

A: Mass of 1 mole = molar mass 1 mole AB contain 1 mole A and 1 mole B

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

A:

Q: Consider the chemical formula for one molecule of methane, CH4. If instead of one molecule we had 10…

A: According to chemical formula of methane ( CH4 ) , it's very clear each molecule of methane has one…

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

A:

Q: Magnesium hydroxide (Mg(OH) 2), as "Milk of Magnesia" can be used to neutralize excess stomach acid,…

A:

Q: Aqueous hydrobromic acid (HBr) will react with solid sodium hydroxide (NaOH) to produce aqueous…

A: The reaction can be written as follows:The given mass of HBr = 69.6 gThe given mass NaOH = 45. g The…

Q: Suppose a piece of silver jewelry contains 7.78×1022 atomsatoms of silver (AgAg).

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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: Ethanol has a molecular formula C2H5 A sample of ethanol has a mass of 2.3 grams. The sample was…

A:

Q: What mass of HCl in grams is neturalized by a dose of milk of magnesia containing 3.26g Mg(OH)2?

A: Given :- mass of Mg(OH)2 = 3.26 g  To calculate :- mass of HCl (in 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: A compound containing only C, H, and O, was extracted from the bark of the sassafras tree. The…

A: Given:Mass of CO2 = 167 mg.Mass of H2O = 34.2 mg.Molar mass of CO2 = 44 g/mol.Molar mass of H2O = 18…

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

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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: If  3.68 x 1021 formula units of sodium bromide are reacted with excess chlorine gas, how many…

A:

Q: Menthol is a flavoring agent extracted from peppermint oil. It contains C, H, and O. In one…

A: no of moles=mass/molar mass General Empirical formula  Cx H 2x Oy

Q: A large electronics company is creating and testing SiC for use in new computer chips. A chemical…

A: Limiting reagentLimiting reagents are substances that are completely consumed in the completion of a…

Q: If 1.800 g of aluminum reacted with an excess aqueous HCl to produce 8.894 g of aluminum chloride.…

A: Answer:- firstly a balanced chemical equation is written then using the mass , mass of Al and cl is…

Q: The density of ammonia, NH3, is 7.71 x 104 g/mL. Calculate the number of moles of ammonia in a 31.9…

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Q: 2 Fe203 + 3 C → 4 Fe + 3 CO2 how many moles of Carbon (C) are needed to produce 1.9 moles of Iron…

A: The given equation is as follows 2Fe2O3 +  3C ----------->>> 4Fe + 3CO2  According to…

Q: What is the formula weight (in g/mol) of copper(II) nitrate trihydrate, Cu(NO3)2 3H₂O? Give your…

A: For the first question, we have to find the formula weight (in g/mol) of copper (II) nitrate…

Q: Combustion of a hydrocarbon in a limited supply of air produces CO in addition to CO2 and H2O. When…

A: Given data :

Q: Consider the following reaction: 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) If 3.60 g NH3 and 5.40 g O2…

A: The answer is as follows:

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: The formula for dinitrogen monoxide is N2O. If a sample of the oxide was found to contain 0.0800 g…

A:

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: Gaseous butane (CH3(CH2)2CH3) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide…

A: 2C4H10 + 13O2 = 8CO2 + 10H2O

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: A grain of sand weighs 7.7 × 10−4 g. How many formula units of silicon dioxide, SiO2, are in one…

A: The mass of one formula unit of SiO2 = 60.08 g/mol

Q: Calculate the number of moles of chlorine present in 120  g g of chlorine gas.

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Q: The formula of acetic acid is CH3COOH (alternatively written as C₂H4O₂). What is the molar mass of…

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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: A chemist weighs 50.0 grams of solid Mg(OH)2. How many moles of Mg(OH)2 are in the sample? How…

A: Given :-  Amount of Mg(OH)2 = 50.0 g  To Calculate :-  No.of moles of Mg(OH)2  No.of formula units…

Q: Ethanol, CH3CH2OH, is the principal type of alcohol found in alcoholic beverages, produced by the…

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Q: An organic compound consists of carbon, hydrogen and nitrogen only. Complete combustion of a 150. mg…

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Q: A beaker contains 100.0 mL of water. To it is added 10.0 mL of dilute nitric acid (HNO3). Calculate…

A: Volume of water = 100.0mL  Volume of dilute nitric acid = 10.0mL Total volume = 110 mL  Density of…

Q: CH4 + 20, → CO, + 2H,0 You have 30 g CH, that you burn in oxygen. How many grams of water (H,0) can…

A: Number of moles of a substance is equal to the mass of substance divided by its molar mass.…

Q: Suppose a student starts with 2.3865 g of a sand mixture and separates the components into 1.3012 g…

A: The objective of this question is to calculate the percentage of SiO2 in the starting mixture of…

Q: Small quantities of oxygen can be prepared in the laboratory by heating potassium chlorate,…

A: Given -> 2KClO3 ----> 2KCl + 3O2 ----(1) Weight of KClO3 = 73.9 gm

Q: Lithium faces an increasing demand since the alkali metal is a key component in a lithium- ion…

A: Given  Number of moles of lithium = 5.40 mol we have to calculate the weight of lithium. Molar mass…

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.