25,963 Answered Questions for the topic chemistry

Chemistry

11/01/23

Calculate the pH of a solution containing 0.0360M glutaric acid and 0.020M potassium hydrogen glutrate.

The Ka values for glutaric acid are 4.52*10^-5 and 3.78*10^-6
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Chemistry

11/01/23

Calculate the pH of a solution containing 0.0300M potassium hydrogen tartrate and 0.018M dipotassium tatrate.

The ka values of tartaric acid is 9.20*10^-4 and 4.31*10^-5
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Chemistry

10/31/23

Consider the reaction: heat released

Consider the reactionB2H6(g) + 3 O2(g) → B2O3(s) + 3 H2O(g) ∆H = -2035 kJHow much heat is released when a mixture of 4.37 g B2H6 and 3.81 g O2 is burned?heat released
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10/31/23

Transport and fluid

I built a mathematical model for transport modeling with two phases water and solid. I made a conceptual model to make the problem more simple. I know that once the transport modeling initiates the... more
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Chemistry

10/31/23

question is in the description
Suppose 0.850 L of 0.400 M H2SO4 is mixed with 0.800 L of 0.250 M KOH. What concentration of sulfuric acid remains after neutralization
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Chemistry

10/31/23

How many (mm) of 2.00 M HCL are required to react with 4.55 g Zn?
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Chemistry

10/31/23

Question is in the description

A flask contains 10.0 mL of HCL and a few drops of phenolphthalein indicator. The buret contains 0.250 M NaOH. It requires 30.3 mL of the NaOhH solution to reach the end point of the titration.... more
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Chemistry

10/31/23

A 0.450 g sample of impure CaCO3 is dissolved in 50.0 mL of 0.150 M HCL. The excess HCL is titrated by 8.55 mL of 0.125 M NaOH. Calculate the mass percentage of CaCO3 in the sample
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Chemistry

10/31/23

what mass of precipitate will form if 1.50 L of highly concentrated Pb(ClO3)2 is mixed with 0.100 L 0.240 M NaI assume reaction goes to completion

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Chemistry

10/31/23

We talked about this in class today, but I dont know how to do this one. Could someone please help me out? Thank you so much!!!
Given the following balanced equation, determine the rate of reaction with respect to [NOCl]. If the rate of Cl₂ loss is 4.84 × 10²⁻ M/s, what is the rate of formation of NOCl? 2 NO(g) + Cl₂(g) → 2... more
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Chemistry

10/31/23

Using the information in the table, the value of the rate constant for the reaction A(g) + 3 B(g) → C(g) + 2 D(g) is
Problem Table[A]₀ (M)[B]₀ (M)Rate (M/min)0.3000.1800.02340.3000.3600.09340.1500.1800.0234It wouldnt let me paste the picture so the first [A] is the first three numbers, second [B] is the second... more
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Chemistry

10/31/23

Find the moles of the product if you start with 2.54 gram of LiOH for the following reaction? H2SO4 + LiOH -> LiSO4 + H2O
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Chemistry

10/31/23

If 4.50 g of HCl are reacted with 15.00 g of CaCO3, according to the following balanced chemical equation, calculate the theoretical yield of CO2

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Chemistry

10/31/23

How many grams of N3 are required to complete the reaction with 3.03 grams of H2 for the following chemical equation? N2 + H2 -> NH3
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Chemistry

10/31/23

What is the oxidation number of "Cr" in Cs2Cr2O7?

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Chemistry

10/31/23

What would be the molar mass of a gas with pressure 22336.4 mm of Hg; 25.5L at 59 degrees C with a mass of 880g? Gas constant is 0.0821 L.atm/mol.K
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Chemistry

10/31/23

oxygen can be prepared in the laboratory by heating potassium chlorate. The reaction is 2KClO3 -> 2KCl + 3O2. How many grams of O2 could be obtained from 2 mole of KClO3?
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Chemistry

10/30/23

finding n=f for a ground state
a ground state of hydrogen atom absorbs a photon of light having a wavelength of 92.27nm. it gives off a photon having a wavelength of 922.7nm. what is the final state of hydrogen atom? nf=
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Chemistry

10/30/23

Word Problem For Chemistry
human blood is a mixture that is vital to human life. What type of mixture is blood? Using the components and properties of blood, explain your answer
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Chemistry

10/29/23

What is the maximum concentration of Ag⁺ that can be added to a 0.00300 M solution of Na₂CO₃ before a precipitate will form? (Ksp for Ag₂CO₃ is 8.10 × 10⁻¹²)
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Chemistry Biochemistry

10/29/23

buffer solution preparing
Prepare:100 mL of 0.15 M sodium acetate buffer, pH 4.6 + 0.9 w/v%. NaCl (you have 0.25 M sodium acetate buffer, pH 4.6 & 9% w/v NaCl solutions.)
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Chemistry

10/29/23

buffer solutions

Prepare 50 mL of 0.1 M acetate buffer, pH 4.6 (by diluting stock solution: 0.25 M sodium acetate buffer, pH 4.6)
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Chemistry

10/29/23

Drug dissolved in DMSO question
I need to make a 1000x stock solution from 1g of MPTP. This stock solution has to be stored in a 1ml eppendorf tube. I want to have a 7.5M stock solution that I can dilute down to 7.5mM when... more
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Chemistry

10/28/23

buffer and solubility
10. Given a patient’s pCO2 of 38 mm Hg and a pH of 7.15, what is the bicarbonate concentration? (NOTE: solubility coefficient of pCO2 is 0.0306 mmol/L/mm Hg and pKa is 6.10)
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Chemistry

10/28/23

molar ratio, buffer
9. What is the molar ratio [A- / HA] of Na acetate (base) to acetic acid (acid) for a buffer with a pH of 6.4 and a pKa of 6.9?
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