J.R. S.

11/24/21

Help with chem question

A coffee-cup calorimeter was calibrated using 10.0 mL of 0.100 M HCl and 2.00 mL of 0.300 M NaOH (ΔHoneutralization= -55.8 kJ/mol). The reaction mixture had 0.300oC increase in temperature. Using... more

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Chemistry

11/23/21

Calculate the concentration of an acid at the equivalence point.

Titrate 25.00 cm^3 of an acetic acid solution with 0.100 mol/dm^3 of sodium hydroxide solution. At the equivalence point, 15.24 cm^3 of the hydroxide solution has been consumed.a) Calculate the... more

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Chemistry

11/23/21

Chemistry Question

Silicon nitride, a very hard, high-temperature resistant ceramic used as the material for turbine blades in jet engines is prepared by reacting silicon with nitrogen gas. The balanced chemical... more

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Chemistry

11/23/21

Chemsitry Question

A 2‎‎5.0-g samp‎‎le of etha‎‎nol (C2‎‎H5OH) at 25.0 °C is hea‎‎ted by the ‎‎additi‎‎on of 40‎‎0.0 J of e‎‎nergy. What is the fi‎‎nal tempe‎‎rature of et‎‎hanol? The spe‎‎cific heat ca‎‎pacity of... more

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Chemistry

11/23/21

Help with chemistry question

Given below are the reaction and the standard enthalpy change of formation values:SiH‎‎4(g) + 2 ‎‎O2(g) ➜ S‎‎iO2(s) + 2 H‎‎2O(l) Δ‎‎Hrxn= –1,51‎‎6.8... more

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Chemistry

11/23/21

would love help with this question

Z2O3(s) is the ionic compound formed from oxygen and a metal with the form Z(s) at 1.00 bar and 298 K.(0.5 points) (a) Draw the Lewis structure for Z2O3. Assume that all the valence electrons from... more

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Chemistry

11/22/21

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:__ NH3 + __ O2 → __ NO + __ H2OWhat is the theoretical yield of water, in grams, when 50.0 g O2 is allowed to react with... more

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Chemistry

11/22/21

Suggest way(s) to increase the concentration of carbon dioxide gas according to Le Chatelier's principle for the reversible reaction of CaCO₃ (s) ⇌ CaO (s) + CO₂ (g) which is an endothermic reaction.

i. remove CaOii. increase the temperature of the systemiii. remove CO₂iv. add CaCO₃You may choose more than one answer

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Chemistry

11/22/21

What is the concentration of sodium ions in 0.300 M Na₃PO₄?

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Chemistry

11/22/21

Given the following redox equation in basic medium Br2 + Mn2+ ------> MnO2 + Br - Find the sum of coefficients of the balanced equation.

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Science Biology Chemistry

11/22/21

The chemical reaction involved is the decomposition of Hydrogen iodide gas into Hydrogen gas and Iodine gas. Starting with 0.900 mol of Hl in an evacuated 2.0-L flask and with Kc=0.014,

what is the molar concentration of hydrogen iodide gas at equilibrium?

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Science Biology Chemistry

11/22/21

If 0.8 mole of Sulfur dioxide and 0.4 mole of nitrogen dioxide are placed into a 2-liter container and allowed to reach equilibrium,

what will be the molar concentration of sulfur dioxide at equilibrium (Products of the reaction are sulfur trioxide and nitrogen monoxide)? The equilibrium constant, Kc, is 64.00 for the reaction... more

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Chemistry

11/22/21

chemistry question I can't answer would like help with

2. (a) Draw at least two plausible resonance contributors for the nitrite ion (NO2-). 2. (b) Assign formal charges to each atom in the resonance structures of the nitrite ion (NO2-). 2. (c) How... more

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Chemistry

11/22/21

This is a chem question that I would like help with

Draw the best Lewis structures for NOF and SeCl4 and include formal charges on atoms with non-zero values. Concisely identify at least four steps of the procedure for drawing the Lewis... more

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Chemistry

11/21/21

Consider the following reaction at 25 °C: 3 NiO(s) + 2 NH₃(g) → 3 Ni(s) + N₂(g) + 3 H₂O(g) If ∆G° = -18.1 kJ/mol, determine the value of the equilibrium constant at 25 °C.

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Chemistry

11/21/21

Conjugate Acid Chemistry

Write the formula of the conjugate acid of the Brønsted-Lowry base, CCl₃COO⁻

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Chemistry

11/21/21

For the reaction A (g) → 2 B (g), K = 14.7 at 298 K. What is the value of Q for this reaction at 298 K when ∆G = -18.3 kJ/mol?

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Chemistry

11/21/21

At 460 K, ∆G = -13.80 kJ/mol for the reaction 2 A (g) → B (g). If the partial pressures of A and B are 7.20 atm and 0.420 atm respectively, what is ∆G° for this reaction?

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Chemistry

11/21/21

Determine the temperature of a reaction if K = 1.20 x 10⁻⁶ when ∆G° = +20.90 kJ/mol.

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Science Biology Chemistry

11/21/21

In what proportion should 5% and 1% hydrocortisone ointments be mixed to prepare a 2.5% ointment?

Applying: Altering Strength, Stock Solutions, and Alligation Calculations

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Science Chemistry Microbiology

11/21/21

If 60 mL of a combination gel of hydrocortisone acetate, 1% w/w, and pramoxine, 1% w/w, is mixed with 12.5 mL of a gel containing hydrocortisone acetate, 2.5% w/w, and pramoxine, 1% w/w,

calculate the percentage strength of each of the two drugs in the mixtureApplying this: Altering Strength, Stock Solutions, and Alligation Calculations

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Science Biology Chemistry

11/21/21

If a pharmacist added each of the following to 22-g packages of 2% mupirocin ointment, what would be the percentage strengths of the resulting ointments:

(a) 0.25 g mupirocin powder and (b) 0.25 g o nonmedicated ointment base? (answer to two decimal places)By applying: Altering Strength, Stock Solutions, and Alligation Calculations

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Science Biology Chemistry

11/21/21

A pharmacist receives a prescription for 60 g of a 0.75% w/w bexarotene gel. How many grams each of a 1% w/w bexarotene gel and gel base must be used?

Using this: Altering Strength, Stock Solutions, and Alligation Calculations

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Science Biology Chemistry

11/21/21

A pharmacist combines the contents of a 30-g tube of a 0.5% ointment and a 90-g tube of a 1.5% ointment of the same active ingredient. What is the concentration of the mixture?

Solve by applying: Altering Strength, Stock Solutions, and Alligation Calculations

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Science Biology Chemistry

11/21/21

A farm product contains a 12.5% w/v concentrate of tiamulin hydrogen fumarate, used to treat swine dysentery when diluted as a medicated drinking water.

Altering Strength, Stock Solutions, and Alligation CalculationsHow many gallons of medicated water may be prepared from a liter of concentrate if the final product is to contain 227 mg of tiamulin... more

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Help with chem question

Calculate the concentration of an acid at the equivalence point.

Chemistry Question

Chemsitry Question

Help with chemistry question

would love help with this question

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:

Suggest way(s) to increase the concentration of carbon dioxide gas according to Le Chatelier's principle for the reversible reaction of CaCO₃ (s) ⇌ CaO (s) + CO₂ (g) which is an endothermic reaction.

What is the concentration of sodium ions in 0.300 M Na₃PO₄?

Given the following redox equation in basic medium Br2 + Mn2+ ------> MnO2 + Br - Find the sum of coefficients of the balanced equation.

The chemical reaction involved is the decomposition of Hydrogen iodide gas into Hydrogen gas and Iodine gas. Starting with 0.900 mol of Hl in an evacuated 2.0-L flask and with Kc=0.014,

If 0.8 mole of Sulfur dioxide and 0.4 mole of nitrogen dioxide are placed into a 2-liter container and allowed to reach equilibrium,

chemistry question I can't answer would like help with

This is a chem question that I would like help with

Consider the following reaction at 25 °C: 3 NiO(s) + 2 NH₃(g) → 3 Ni(s) + N₂(g) + 3 H₂O(g) If ∆G° = -18.1 kJ/mol, determine the value of the equilibrium constant at 25 °C.

Conjugate Acid Chemistry

For the reaction A (g) → 2 B (g), K = 14.7 at 298 K. What is the value of Q for this reaction at 298 K when ∆G = -18.3 kJ/mol?

At 460 K, ∆G = -13.80 kJ/mol for the reaction 2 A (g) → B (g). If the partial pressures of A and B are 7.20 atm and 0.420 atm respectively, what is ∆G° for this reaction?

Determine the temperature of a reaction if K = 1.20 x 10⁻⁶ when ∆G° = +20.90 kJ/mol.

In what proportion should 5% and 1% hydrocortisone ointments be mixed to prepare a 2.5% ointment?

If 60 mL of a combination gel of hydrocortisone acetate, 1% w/w, and pramoxine, 1% w/w, is mixed with 12.5 mL of a gel containing hydrocortisone acetate, 2.5% w/w, and pramoxine, 1% w/w,

If a pharmacist added each of the following to 22-g packages of 2% mupirocin ointment, what would be the percentage strengths of the resulting ointments:

A pharmacist receives a prescription for 60 g of a 0.75% w/w bexarotene gel. How many grams each of a 1% w/w bexarotene gel and gel base must be used?

A pharmacist combines the contents of a 30-g tube of a 0.5% ointment and a 90-g tube of a 1.5% ointment of the same active ingredient. What is the concentration of the mixture?

A farm product contains a 12.5% w/v concentrate of tiamulin hydrogen fumarate, used to treat swine dysentery when diluted as a medicated drinking water.

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