Silicon Si exists in Earth's crust as SiO2 Calculate the percent composition by mass of O and Si in SiO2 Round your answer to 4 significant digits.

Q: b For each cell write the electrode reactions, and hence the overall reaction, that occur as the…

A: b) An electrochemical cell that converts the chemical energy of spontaneous redox reactions into…

Q: a) how many moles of Na3PO4 are in a sample with a mass of 80.11 g? b) how many atoms of oxygen are…

A: a) given, mass of Na3PO4 = 80.11 g moles of Na3PO4 = ?  Note:  molar mass of Na3PO4 = 163.94 g/mol

Q: Consider a 134.5 g sample of the compound manganese(IV) perchlorate.What is the molar mass of…

A: Since, Molar mass is the sum of atomic masses of the atom present in the molecule or compound. Thus,

Q: A sample of ammonium carbonate (MM = 96.09 g/mol) was found to contain 7.6 x 1023 AMU of N.  How…

A:

Q: Give handwritten answer with explanation

A:

Q: 2.50 g of KCIO3 decomposes by the equation : 2KCIO3(s) ---> 2KCl(s) + 302(g). What volume, in…

A: Here we have to apply mole concept. correction: it is volume of oxygen produced.

Q: How many carbon atoms are in 2.50 g of glucose (C6H1206)? 6.02 x 1023 C-atoms 8.37 x 1022 C-atoms O…

A: Given,  1) The mass of glucose ( C6H12O6 ) = 2.50 g.  The number of carbon atoms in this mass is: 2)…

Q: The forensic technician at a crime scene has just prepared a luminol stock solution by adding 13.0 g…

A: The mass of luminol dissolved = 13.0 g The volume of H2O = 75.0 mL We have to find the molarity of…

Q: 2. Write the formula for the following binary ionic compounds. In addition, complete a particle…

A:

Q: Write the balanced NET ionic equation for the reaction when KCl and Na₃PO₄ are mixed in aqueous…

A: Balance chemical equation is equation in which number of atoms on both sides of the equation are…

Q: he molarity of nitrate ions in 125 ml aqueous solution of iron 3 nitrate is found to be .0565 M…

A:

Q: Calculate the kinetic energy of a 2.3 x 104 kg airplane moving at a speed of 266. Round your answer…

A: The mass of airplane, m = 2.3×104 kg  Speed of airplane, v = 266 m/s  Kinetic energy of the…

Q: Ether solution Benzoic acid Ether layer OH ther layer 1 H₂N- Ethyl 4-aminobenzoate 1. Add 3 M HCI 2.…

A:

Q: Element X needs 508,379 kJ/mol to remove one of its 1s electrons. Calculate Zeff charge felt by its…

A: Given that, for an element X, The amount of energy required to remove one electron from its 1s…

Q: 7:23 PM Thu Oct 6 < STARTING AMOUNT What quantity in moles of MnO3 are produced when 4.30 kg of…

A: Given - Mass of Oxygen gas =4.30 kg = 4300 gm (1 kg = 1000gm)  2Mn (s) +3O2(g) -&gt; 2MnO3(s)

Q: Calculate the heat, in kJ, that would be involved in condensing 15.8 g of CH₃OH. (∆Hvap = 38.0…

A:

Q: 17) Is each proposed structure in Figure 4, a plausible Lewis structure for CO₂? Why or why not?…

A: Lewis structure is a representation of valence shell electrons of all the atoms in a molecule. In…

Q: (b) HO COOH H excess H₂O

A:

Q: I understand where the proton transfer occurs but not what the products will look like. Can you draw…

A: Organic reactions are those in which organic reactant react to form organic product. In the given…

Q: For the following and antibonding orbitals, show how bonding MO can be generated based on the choice…

A:

Q: Use the References to access important values if needed for this question. References A student ran…

A:

Q: dentifying Enantiomers, Diastereomers, and Meso Compounds Part A Stereoisomers of…

A: We have been given an organic compound and we have been asked to draw all the stereoisomers of this…

Q: Name the following compound

A:

Q: 1.2×10−2 mol ethanol Express your answer using two significant figures.

A:

Q: 5.8 Which compound is meso? OH OH ОН 옷 옷 & 요 (a) (c) (d) (e) 앨 (b)

A: Meso compound: If an organic compound contains more than one chiral carbon and a plane of symmetry…

Q: Stoichiometric coefficients are used to describe the mole ratio. O True O False

A: In balanced chemical reaction, stoichiometric coefficients  represent the moles of reactants and…

Q: An important part of acid/base chemistry is neutralization, or when an acid or a base is completely…

A:

Q: Calculate the pH of a 0.0159 M aqueous solution of formic acid (HCOOH, Ka 4). = 1.8×10

A:

Q: Calculate the pH of a 0.432 M aqueous solution of dimethylamine ((CH3)2NH, K₁= 5.9x10-4). pH =

A:

Q: CHWK 1 25 Convert the skeletal Structure below into Please a Line Bond Formula. NH₂

A:

Q: 16. The equation E = mc² is one of the lasting symbols of science. Answer the following 2 questions…

A: To answer: i. Explain what each term in this equation means and what energy is being calculated.…

Q: At-179 °C, Keq 28.7 for the reaction: a) What is the value of Keq for the reaction NOBr(g) NO(g) +…

A: Some important characteristics of equilibrium constant are :  If the reaction is reversed, the value…

Q: Humans exhale an average of 1.423*1025CO2 moleculesnper day. How many grams of CO2 is this?…

A:

Q: NICKEL(II) SALT EXP. UNKNOWN # Mass of unknown, (g) Mass of crucible + beaker + precipitate, (g)…

A:

Q: Chemistry 2. Draw the peptide with the sequence YNEM at pH 7.4 (use dashes and wedges to convey…

A: N-terminus: It is the start of a polypeptide corresponding to the free amine group present at the…

Q: These values may be useful for the following question(s). speed of light = 3.00 x 108 m/s The mass…

A: Binding energy is defined as a energy hold together nucleus.

Q: Consider an oxygen atom. Which of the following electron orbitals would be unused for a ground state…

A: Since, Electronic configuration represent the electron present in orbital in which way. Arrangement…

Q: your ice cream of choice has 330 mg of sodium chloride per pint. one pint of ice cream has 15 ounces…

A: Given that we have 1 pint of icecream. I ounce = 29.5735 ml of water.  Since 1 pint = 15 ounce,  =…

Q: 1.034g 5.2mL 6.5159 3,8479 24.7819 20.4989 Weight of Watch Glass, Filter Paper and CuCl Precipitate…

A: Given data :  1. Weight of Copper = 1.034 g  2. Weight of Watch Glass and Filter Paper = 24.781 g…

Q: Which of the following is the 1,4-addition product in the reaction shown below? A) HBr Br B) Br D)

A:

Q: Answer the data and who among them has the best  goodness of fit model?

A: In the graphical determination of order; A reaction is 0 order when [NO2] vs time(s) graph is a…

Q: CH₂ CH-CH₂ b. CH CCH₁ CH₂ CH-CH₂ CH, CH CH₁ CC CH₂ d. CH C CH CH CH. CH₁ CH₂ CH CH CH. CH CH₂ f. CH,…

A:

Q: Draw the Lewis structures for each of the species below, then State the molecular arrangement and…

A:

Q: нбон H₂SO4

A:

Q: . Give the formula and name of an ionic compound cont

A: Ionic compounds are those which when dissolved in water dissociate into ions i.e. is one cation and…

Q: draw resonance structures for this structure by clear handwriting!!!!

A: Resonance is a phenomenon that describes the delocalization of electrons within a molecule. It…

Q: Calculate the hydronium ion, H₂O*, and hydroxide ion, OH, concentrations for a 0.0285 M HCl…

A:

Q: finding the molecular structure.

A: Infrared spectroscopy deals with the study of interaction of compounds/ organic molecules with…

Q: Which compound corresponds to this IR and proton NMR? Transmitance 0.8- 0.5- 0.4 0.2 10 a)…

A: IR spectra gives the information of functional groups of unknown compound based on the…

Q: At -8.80 °C the pressure equilibrium constant K = 4.0 × 10³ for a certain reaction. Here are some…

A: Given  T1= -8.80 c  Kp= 4.0×10^5 Heat absorbed = 113 kj/mol T2= -32 C

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.