J.R. S.

07/16/22

How many minutes must pass before the mass of the radioactive element decreases to 15.195g?

You have 98.569g of a radioactive element with a half-life of 87.75minutes. How many minutes must pass before the mass of the radioactive element decreases to 15.195g?

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Chemistry

07/15/22

electrode reaction

Predict what reaction (if any) will occur between HCl and Co(s), and between HBr and Pt(s).

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Chemistry

07/15/22

(6 pts total) Propose an acid-base reaction to prepare the following salts. Decide whether each salt is acidic, basic or neutral.

A). NaBrO3B) NH4I

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Math Chemistry

07/15/22

What is ΔG°rxn for the cell reaction for each reaction?

What is ΔG°rxn for the cell reaction for each reaction?Anode: Cr(s) → Cr+3(aq) Ered= -0.7237V Cathode: I2(aq) → I-1(aq) Ered = +0.5182V Anode: NO3-1(aq) → HNO2 (aq) Ered = +0.9513V Cathode:... more

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Chemistry

07/15/22

Help me solve this

You wanting to develop a new food production technology that combines CO2(g) and H2O(g) directly to form fructose, C6H12O6(s), and O2(g).a CO2(g) + b H2O(g)  c C6H12O6(s) + d O2(g)Substance ... more

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Chemistry

07/15/22

Chemistry - Gas Stoichiometry

How much faster would He gas effuse than Ne? (record your answer to 2 decimal places)

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Chemistry

07/15/22

Chemistry - Gas Stoichiometry

Gas A has a molar mass 24.9 while gas B has a molar mass 94.6. Which gas will effuse slower? A or B?

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Chemistry

07/15/22

What volume (in mL) of 0.2550 M HCI is required to neutralize 50.00 mL of 0.8000 M NaOH?

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Chemistry

07/14/22

Chemistry 102: Acid Equilibrium: Calculate Q and answer multiple choice question

9). At 25oC the Ksp for PbCl2 is 1.6 × 10–5.part 1). Calculate Q for the following: 125.0 mL of 0.0900 M Pb(NO3)2 is mixed with 75.0 mL of 0.0200 M NaCl at 25oCpart 2). Will a precipitate form... more

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Chemistry

07/14/22

Chemistry 102: Acid Equilibrium: Write estimated pKa

4. The graph shows the titration curves of a strong acid and a weak acid. Estimate the pKa of the weak acid from its titration curve. Write the estimated pKa to one decimal place.

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Chemistry

07/14/22

Chemistry 102: Acid Equilibrium: raising pH

2. Consider the following reaction:CH3COOH(aq)+OH−(aq)CH3COO−(aq)+H2O(l)How much 5.60 M NaOH must be added to 650.0 mL of a buffer that is 0.0185M acetic acid and 0.0265 M sodium acetate to... more

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Chemistry

07/14/22

Chemistry 102: Acids: Find OH^- Concentration

12. Compounds containing nitrogen are often weak bases. One example is aminoethanol, which has the formula HOCH2CH2NH2 and a Kb value of 3.1 ×× 10–5.Calculate the OH– concentration in a... more

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Chemistry

07/14/22

what is- (OH)- + H20 -------- >

like (H)+ + H20 ------- > (H3O)+

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Math Chemistry

07/14/22

I think I'm getting the wrong answer to this problem I got -991.61

The combustion of propane by the following unbalanced chemical reaction:a C3H8(g) + b O2(g) --> c CO2(g) + d H2O(g)How many kilojoules of Gibb's Free Energy are liberated by burning 21.086g of... more

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Math Chemistry

07/14/22

How many kilojoules of Gibbs Free Energy

The combustion of ethane by the following unbalanced chemical reaction:a C2H6(g) + b O2(g) --> c CO2(g) + d H2O(g)How many kilojoules of Gibb's Free Energy are liberated by burning 21.624g of... more

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Chemistry

07/14/22

Help me solve this

You have dissolved 19.178g of barium chloride in water. If all of the Gibb's Free Energy liberated by this reaction is transferred to a 40.107g block of copper at 16.38°C, what is the final... more

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Chemistry

07/14/22

What is the expected pH of a 0.806M solution of formic acid in water?

What is the expected pH of a 0.806M solution of formic acid in water? Ka(HCO2H) = 1.798x10-4

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Chemistry

07/14/22

What is the expected pH of a 0.723M solution of hypochlorous acid in water?

What is the expected pH of a 0.724M solution of hypochlorous acid in water? Ka(HClO) = 2.931x10-8

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Chemistry

07/14/22

Chemistry - Individual Gas Laws

A steel tank contains a mixture of Ar and He gases. If the partial pressure of helium in the tank is 1,185 mmHg, and the partial pressure of argon is 4,013 mmHg, what is the total pressure in the... more

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Chemistry

07/14/22