139 Answered Questions for the topic chemical engineering

Chemical Engineering Chemistry Statistics

6d

Finding determinate source of error

An analyst applies the neutralization titration method to determine the amount of NaHCO3 in an antacid tablet. Before the measurement, the analyst checks the method by titrating a standard sample... more
Chemical Engineering Chemistry

6d

pH Calculating

Calculate the pH of a solution prepared by dissolving 2.25 g lactic acid (90 g/mol) in 100 mL of 0.25 M NaOH solution. ( Ka (lactic acid)= 1.38x10-4 )
Chemical Engineering Chemistry

6d

Calculating the pZn value

Calculate the pZn value after the addition of 25 mL of titrant in the titration of 50 mL of 0.01 M Zn2+ solution buffered to pH 11 with 0.02 M EDTA. (Kf = 3.2 x 1016 α4 = 0.85)
Chemical Engineering Chemistry

6d

Buffer solution pH calculation

What is the pH of the buffer formed by mixing 50 mL of 0.2 M NaH2PO4 with 50 mL of 0.12 M HCl. ( Ka1(H3PO4)= 7.11x10-3 Ka2(H3PO4)= 6.32x10-8 Ka3(H3PO4)= 4.5x10-13 )
Chemical Engineering Chemistry

12/12/21

Chemistry Questions

What do most of the rocks and minerals in the Earth’s crust consist of? Give an example.Definition of ionic compound?What does the chemical formula of an ionic compound represent? What is the name... more
Chemical Engineering Science Chemistry Physics

11/09/21

Compute the total enthalpy change by using the Hess Law

Use the Hess law to calculate the total enthalpy2H2O ------> 2H2 + O2 +572 KJ/mol2HF  ------> H2 + F2 + 542 KJ/mol
Chemical Engineering Science Chemistry Physics

11/09/21

----------Chemistry--------

Prove that the enthalpy change of formation is equal to the total change reaction using carbon dioxide.C2H5OH + O2 ------> CO2 + H2OC2H5OH ------- ΔH= -278KJ O2 ------- ΔH= 0 ... more
Chemical Engineering Mass Transfer

11/03/21

PLEASE HELP ME OUT ASAP!

Consider tablets that are contained in a blister package composed of a flat lidding sheet and a second, formed sheet that includes troughs to hold each tablet. The formed sheet is L = 50 micron... more

11/01/21

;))))))))) Chemistry

why does when we increase the concentration of a set of reactant the rate of chemical reaction also increases?

11/01/21

-------CHEMISTRY------------

Explain the mechanism of catalyst in increasing and decreasing the rate of chemical reaction.

11/01/21

CHEMISTRY!!!!!!!!!!!!!!!!!!!!!!!!!

why does when the greater the frequency of successful collisions between reactant particles happens the greater the reaction rate.

10/28/21

Aluminum Sulfate Safety with Alcohol and Photopolymer Resin

I'm using 99.9% IPA as a wash agent for photopolymer resins before curing. This is usual and customary for the wash process. I have experimented with using Aluminum Sulfate as a flocculant with... more

10/26/21

Find the morality and molality

16.0 g CH3OH and 50.0 g water are combined to make a solution. What is the molarity and molality of methanol (CH3OH) in the solution if the density of the solution is 0.955 g/mL?
Chemical Engineering Chemistry Chemistry Biochemistry

10/26/21

Find the electronegativity difference

What is the electronegativity difference of CH3OH?Carbon=2.5 Hydrogen=2.1 Oxygen=3.5a. 1.1b. 5c. 0.9d. none of the above

10/26/21

Find the molarity of this solution.

In 20.0 degree Celsius, a 0.258 m aqueous solution of C6H12O6 (glucose) has a density of 1.017 g/mL. Find the molarity of this solution.

10/14/21

Ibuprofen (C13H18O2) is an analgesic (painkiller). What is the molar mass of ibuprofen?

Ibuprofen (C13H18O2) is an analgesic (painkiller). What is the molar mass of ibuprofen? 

10/14/21

What is the mass of 1 mole of barium sulfate (BaSO4) use to take X rays of the gastrointestinal tract?

What is the mass of 1 mole of barium sulfate (BaSO4) use to take X rays of the gastrointestinal tract? a. 64 g b. 185.33 g c. 233.33 g d. 169.33 g

10/14/21

A sample of gold contains 7.02 x 1024 atoms. How many moles of gold are there?

A sample of gold contains 7.02 x 1024 atoms. How many moles of gold are there? a. 11.7 x 1023 moles b. 7.02 moles c. 6.022 x 1023 moles d. 11.7 moles

10/14/21

How many molecules are in 16.8 moles of H2O?

How many molecules are in 16.8 moles of H2O? a. 6.022 x 1023 molecules b. 16.8 molecules c. 1.012 molecules d. 1.012 x 1025 molecules

10/14/21

How many moles of each type of atom are in one mol of C6H12O6?

How many moles of each type of atom are in one mol of C6H12O6? a. 1 mole of C atoms, 12 moles of H atoms, and 1 mole of O atoms b. 6 mole of C atoms, 12 moles of H atoms, and 1 mole of O... more

10/09/21

Balance the following chemical equation. Use coefficients in front the reactants or products that need to be balanced. If the coefficient is one, write the number "1"

_________________ MgCl2 + _________________ K → _________________ KCl + _________________ Mg

10/09/21

Balance the following chemical equation.

Q1 _______________ NaN3 → _______________ Na + _______________ N2Q2_______________ N2H4 + _______________ Cl2 → _______________ N2 +  _______________ HCl

10/09/21

Balance the following chemical reaction:

 _______________ Fe2O3 + _______________ C → _______________ Fe + _______________ CO2_______________ Li + _______________ N2 → _______________ Li3N

10/09/21

Match is statement with the correct option: oxidation or reduction

The loss of electrons is _________________.The gain of electrons is _______________.Addition of oxygens is _______________.Removal of oxygens is _________________.Addition of hydrogens is... more

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