What amount (moles) is represented by each of these samples? 32.2 mg caffeine, CaH10N4O2 Amount =  mol  4.58 x 10 21 molecules of ethanol, C2H5OH Amount =   mol 2.55 g of dry ice, CO2 Amount =   mol

Q: A sample of concentrated nitric acid has a density of 1.41 g/mL and contains 70.0% HNO3 by mass. (a)…

A: Given: Mass % of HNO3=70.0 % Density  = 1.41 g/mL   To calculate: (a) Mass of HNO3 per liter (b)…

Q: The density of acetic anhydride (C4H603) is 1.08 g/mL. Calculate the moles of acetic anhydride…

A:

Q: A 13.2010g sample of hydrated zinc sulfate, ZnSO4 • xH2O), was strongly heated until no further…

A: Given that,  Mass of hydrated zinc sulfate, ZnSO4 • xH2O = 13.2010 g  The final mass of solid…

Q: RITROE 19 K 39.30 132 20 Ca 21 Sc Ti Molarity (M M₁ = M₂V₂ Convert the mass 1570.3 mg of a chunk of…

A:

Q: 3 Cu +8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H₂O In the above equation how many moles of water can be made…

A: Number of moles is calculated by dividing given mass by molecular mass.  A balanced equation is used…

Q: Copper (II) sulfate pentahydrate, CuSO4 • 5 H2O, has 5 moles of H2O for each mole of CuSO4 in the…

A:

Q: The mineral hedyphane has the formula Pb3Ca2(AsO4)3Cl  (m.w = 1154.0 g/mol).  How many moles of…

A: A chemical formula represents the number of elements present in a compound in their relative…

Q: 3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H₂O In the above equation how many moles of water can be made…

A:

Q: An organic liquid is either methyl alcohol (CH3OH), ethyl alcohol (CH3CH2OH) o a mixture of the two.…

A: The combustion reaction of methyl alcohol and ethyl alcohol:

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

A:

Q: 1.00 mol/L of NaX (aq) contains 4.2% solute by mass, what is the atomic mass of X? What anion could…

A: Molarity = moles of solute/Volume of solution (L)Moles of solute = mass of Solute/molar mass of…

Q: A student heated the 3.572 g sample of chromium (III) chloride on a hot plate until no more water…

A: Given that, Mass of hydrated chromium (III) chloride (CrCl3•xH2O) = 3.572 g  [* x = number of moles…

Q: A mixture is 19.9% NaCl, 21.0% CaCl2, and 59.1% NaBr. What mass of the mixture contains 0.485 moles…

A: mass of the mixture that contains 0.485 moles of chloride ions moles of sodium ions present in 24.0…

Q: How many moles are present in 100. g of aspirin (C 9H 8O 4, molar mass 180.2 g/mol)?

A: The given mass of aspirin is 100g. Molar mass of aspirin is 180.2 g/mol.

Q: 2 Na(s) + Cl₂(g) Ang = gas 2 NaCl(s) mol

A: We have to calculate ∆ngas

Q: CH4(g)   +    2 O2(g)  ------->   CO2(g)   +    2 H2O(g) What mass of water is produced by the…

A: 1- First determine the moles of methane :  moles of methane = ( mass / molar mass)  moles of methane…

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: The number of moles in 37.80 g of C2H6O (molar mass = 46.1 g/mol) is  9.072 x 10^2  8.200 x 10^-1…

A: Correct: 2.  8.200 x 10-1 Given that,  Weight of C2H6O given = 37.80 g Molar mass of C2H6O = 46.1…

Q: The density of acetic anhydride (C4H6O3) is 1.08 g/mL.  Calculate the moles of acetic anhydride…

A:

Q: The calcium ion is a dietary mineral essential to good nutrition. Calcium is necessary for the…

A:

Q: An alloy is found to be 41.8% Zn and the rest is Cu. If 15.0 g of Cu is added to 45.0 g of This…

A: Mass of the alloy = 45g% of copper in the alloy = (100-41.8) = 58.2%% of zinc in the alloy =…

Q: Determine the quantity (g) of pure CaCl2 in 7.5 g of CaCl2•9H2O. Please show the steps involved.

A: Number of moles of CaCl2.9H2O can be calculated from the given mass and molar mass:

Q: A 13.2010g sample of hydrated zinc sulfate, ZnSO4 • xH2O), was strongly heated until no further…

A:

Q: Liquid nitromethane was once widely used as an explosive but is now much more common as a fuel for…

A:

Q: What is the molarity of a solution made by dissolving 2.355 g of sulfuric acid (H2SO4) in water and…

A: Molarity is one of the ways to measure the concentration of a solution. The unit of molarity is…

Q: The density of acetic anhydride (C4H603) is 1.08 g/mL. Calculate the moles of acetic anhydride…

A: Density is a physical quantity.  Density is defined as the ratio of mass of the substance to that of…

Q: You have 235.5 g of Ba(OH)2   How many moles of barium hydroxide, Ba(OH)2, are present in 235.5…

A:

Q: what is the percent of SiO2 in the starting mixture?

A: Percent by mass = (mass of a component in mixture /total mass of mixture) × 100%  Given :- mass of…

Q: Determine the quantity (g) of pure MgSO4 in 2.4 g of MgSO4•7H2O. Please show the steps.

A: The percentage composition of a compound is found by the comparing the mass contributed by the each…

Q: A person drinks 1.50 × 103 g of water, H2O, per day. How many moles is this?

A: Given,Mass of water = 1.50×103 gMolar mass of water is 18.015 g/mol

Q: What is the molarity of a solution prepared by dissolving 44.2 g of Ca(NO3)2 into enough water to…

A: 44.2 g of CaNO32 is dissolved in enough water to make 274 mL of solution .We have to calculate the…

Q: What is the mass in grams of each quantity of lactic acid (C 3H 6O 3, molar mass 90.08 g/mol), the…

A: Given, Molar mass = 90.08 g/mol Formula Used, moles (n)=Mass requiredMolar Mass 1 mole = 6.023 x…

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.