04/19/21

#### ΔG° = ΔH° - TΔS°

For the reactionC2H4(g) + H2O(g)  CH3CH2OH(g)G° = -7.9 kJ and S° = -125.7 J/K at 300 K and 1 atm.This reaction is (reactant, product) ______favored under standard conditions at 300 K.The standard... more

04/15/21

#### I need help solving in liters, can anyone help me please? It would be so much appreciated, thank you!

A gas sample initially has a volume of 178L, a temperature of 643K, and pressure of 292kPa. If the temperature is adjusted to 57K and the pressure is adjusted to 151kPa, what is the final volume in... more

04/11/21

#### When finding pH of acidic buffer solution using Ka, why do we use the salt concentration in the Ka equation?

for example when CH3COOH and CH3COONa are used to make a buffer solution, why we use the [CH3COO-] of the salt in the Ka equation of the acid? isn't the [CH3COO-] from acid not the same... more

04/05/21

#### Acids/Bases: Addition of H+ to an unbuffered solution

Determine the change in pH when 0.004 mol H+ were added to a 0.010M unbuffered acetic acid (chemical formula: HC2H3O2) solution. Assume that the volume of the solution is 1.0L.

04/04/21

#### Finding the produced gas from baking soda and vinegar

I’m trying to understand how to calculate the gas produced (carbon dioxide) when mixing baking soda and vinegar. I have the balanced equation part, but unsure what to do next. I know it will... more

04/04/21

#### SOLVING CHEMISTRY QUESTION GRADE 11 FSC PRE MED

Three gases (8.00g of methane, CH4, 18.0g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0L container. At 23.0°C, the total pressure in the container was... more

04/03/21

#### What is the value of Kb for coccaine?

The much-abused drug cocaine is an alkaloid. Alkaloids are noted for their bitter taste, an indication of their basic properties. Cocaine, C12 H21 O4 N, (MM: 303.491) is soluble in water to the... more

04/03/21

#### Creating Ph buffers

"Determine the volumes of 0.10 M CH3COOH and 0.10 M CH3COONa required to prepare 10 mL of the following pH buffers: pH 4.7, pH 5.7. How many grams of CH3COONa would it be? (Note: the pKa of CH3COOH... more

03/22/21

#### How to find concentration with initial concentration and moles consumed?

Plot on to graph moles of S2O8 vs time to achieve M/s.The initial concentration of S2O8: 0.05M (added is 2.5mL of 0.200M, but it was diluted so 0.200 x 2.5/10mL = 0.05M). Below is the time (s) and... more

03/22/21

#### question for chemistry

What is the temperature in degrees Celsius of a 0.7 mol sample of argon gas that occupies 3.6 L at a pressure of 1163.9 kPa?

03/22/21

#### question for chemistry

How many moles of carbon dioxide gas are in a 1.19 L sample that is at standard pressure and 240 K.

03/22/21

#### A structure with a more stable conjugate base will be more acidic. Ha is more acidic than Hb. Choose the factor that best explains the increased stability of the first structure's conjugate base.

A structure with a more stable conjugate base will be more acidic. Ha is more acidic than Hb. Choose the factor that best explains the increased stability of the first structure's conjugate base.

#### Write the charge and full ground-state electron configuration of the monatomic ion most likely to be formed by P.

Charge: -3And I got 1s22s22p63s23p3 for the ground-state electron configuration, but it is incorrect. What does ground state configuration mean?

03/19/21

#### Stoichiometry Map

2ZnS + 3O2 —> 2ZnO + 2SO2

03/18/21

#### How could this experiment be used to find the molecular mass of an unknown gas?

1.Obtain a length of glass tubing. Make sure it is completely dry. Lay the tubing on your bench. 2. Place one stopper with a cotton swab in each end of the tubing. Using a crayon, mark the glass to... more

03/18/21

#### Determine the % for sucrose, C12H22O11, more commonly known as table sugar.

Find % composition of sucrose

03/17/21

#### 5.000ml of 0.200M Fe(NO3)3 combined with 4.000ml of 0.00200M NaSCN in a 50.00ml volumetric flask filled with water. What is the diluted concentration for the SCN- ion, after the solution is made

5.000 ml of 0.200 M Fe(NO3)3 is combined with 4.000 ml of 0.00200M NaSCN in a 50.00 ml volumetric flask . The flask is then filled to the mark with water. What is the diluted concentration for the... more

03/11/21

#### Calculate ΔS° for each of the following reactions.

a) 2HNO3(l) + 3H2S(g) --> 4H2O(l) + 2NO(g) + 3S(s)b) PCl5(g) + 4H2O(l) --> 5Cl-(aq) + H2PO4-(aq) + 6H+(aq)c) MnO4-(aq) + 3Fe2+(aq) + 4H+(aq) --> 3Fe3+(aq) + MnO2(s) + 2H2O(l)

02/22/21

#### A solution is made initially with 0.200 M HIO₃ (Kc = 0.170). Once the equilibrium below is established, what is the equilibrium concentration of H⁺ ions? HIO₃ (aq) ⇌ H+ (aq) + IO₃⁻ (aq)

A solution is made initially with 0.200 M HIO₃ (Kc = 0.170). Once the equilibrium below is established, what is the equilibrium concentration of H⁺ ions? HIO₃ (aq) ⇌ H+ (aq) + IO₃⁻ (aq)

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