05/18/21

What quantity of heat (in kJ) would be required to convert 16.6 g of ice to water at 0.00°C? (∆Hfus = 6.01 kJ/mol for water)
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05/18/21

If 601 J of heat is available, what is the mass in grams of iron (specific heat = 0.450 J/g･°C) that can be heated from 22.5°C to 120.0°C?
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05/18/21

In the following reaction, what is the quantity of heat (in kJ) released when 4.73 moles of CH₄ are burned?
CH₄ (g) + 2 O₂ (g) → CO₂ (g) + 2 H₂O(g) ∆H° = -802 kJ/mol
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05/18/21

How many molecules are in 8.25 moles of iron (III) chloride?

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05/18/21

How many molecules are in 0.0913 moles of Selenium?

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05/18/21

How many molecules are in 13.45 moles of aluminum?

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05/17/21

Is this correct?
2H2O2 (aq)à 2H2O (l) +O2 (g) +O2 (g)          standard electrode potential: 0.55 VThe equation and standard cell potential for the decompositions of H2O2 (aq) in acidic solution at 25 degrees... more
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05/17/21

You need to produce 5.00 grams of pure aspirin for a research project. The yield of the reaction is reported to be 80.0% from salicylic acid.

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05/17/21

Calculate the [H3O+] and [OH-] concentrations in a 0.75 M solution of HBr.

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05/17/21

Molarity Practice
6c. Complete the table:___________________________________________________________________| Solute | Mass of solute | Moles of solute | Volume of solution | Molarity of solution || MgSO4 | 0.538 g... more
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05/17/21

Molarity Practice
6b. Complete the table:___________________________________________________________________| Solute | Mass of solute | Moles of solute | Volume of solution | Molarity of solution || MgSO4 | 0.538 g... more
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05/17/21

Molarity Practice
6. Complete the table:___________________________________________________________________| Solute | Mass of solute | Moles of solute | Volume of solution | Molarity of solution || MgSO4 | ... more
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05/17/21

Is this correct?
2H2O2 (aq)à 2H2O (l) +O2 (g) +O2 (g)          standard electrode potential: 0.55 VThe equation and standard cell potential for the decompositions of H2O2 (aq) in acidic solution at 25 degrees... more
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05/16/21

Use a K+ NO3- salt bridge (100 mL on both sides)
Use a K+ NO3- salt bridge (100 mL on both sides)1M LNO3 1M R(NO3)2(d) If 1.0 gram of solid NaCl is added to each half-cell, the cell voltage increases. Explain why. (e) If 20.0 mL of distilled... more
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05/15/21

How to add absolute uncertainties PLEASE HELP!
Instrument   Type of instrument Limiting of reading Absolute Uncertainty Total absolute uncertainty for experiment Electronic Scale Digital 0.1g... more
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05/15/21

What is the difference between standard deviation and standard error?
Hi, I was wondering what the main difference is between standard deviation and standard error and how do I interpret them on excel graphs?
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05/13/21

The mass of a sodium-23 nuclide is 22.9898 amu. What is the binding energy per mole of sodium-23 nuclides?
The mass of a sodium-23 nuclide is 22.9898 amu. What is the binding energy per mole of sodium-23 nuclides?
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05/13/21

Calculate either [H3O+] or [OH−] for each of the solutions at 25 °C.
Solution A: [OH−]=1.69×10−7 M; [H3O+]=Solution B: [H3O+]=8.61×10−9 M; [OH−]=Solution C: [H3O+]=7.59×10−4 M; [OH−]=Which of these solutions are basic at 25 °C?Solution C: [H3O+]=7.59×10−4 MSolution... more
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05/11/21

How many grams of HBO2 are produced from 5.32 moles of BtoH6
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05/11/21

Electronegativity and Molecules
How many resonance structures exist for the formate ion, HCO2-?
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05/11/21

Electronegativity and Molecules
A. Find the electronegativity difference between K and Cl.B. Find the electronegativity difference between N and N.C. Find the electronegativity difference between C and S.D. Find the... more
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05/11/21

Is Ammonium Chloride (NH4CL) an endothermic reaction when in water?
I was wondering if Ammonium Chloride is an endothermic reaction when mixed with water in a calorimeter and what the effect of increasing the amount of water in the calorimeter would have on the... more
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05/11/21

Which of the following can be determined about ∆So for the reaction?
A student conducts a reaction at 298 K in a rigid vessel and the reaction goes to completion. The temperature of the reaction vessel drops during the reaction. Which of the following can be... more
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05/11/21

ASAP explain and clearly show answer
Fe2+(aq)+Zn(s)→Fe(s)+Zn2+(aq)E°cell=+0.32VA galvanic cell generates a cell potential of +0.32V when operated under standard conditions according to the reaction above. Which of the following pairs... more
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05/10/21

What is the standard reduction potential for the half reaction represented above?
2H2O2 (aq)à 2H2O (l) +O2 (g) +O2 (g)          standard electrode potential: 0.55 VThe equation and standard cell potential for the decompositions of H2O2 (aq) in acidic solution at 25... more
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