02/09/22

How to find activation energy (kJ/mol) given the following?
The equation of a trendline of 1/Temp (K^-1) vs. ln(1/time) --> y = -4548.6x + 10.905R = 8.314 J / k mol
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02/07/22

The atomic radius of metal X is 125 picometers (pm) and a crystal of metal X has a unit cell that is face-centered cubic. Calculate the density of metal X (atomic weight = 42.3 g/mol)
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02/07/22

Gaseous butane (CH3(CH2)2 CH3) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O).
If 18.5g of water is produced from the reaction of 34.3g of butane and 87.1g of oxygen gas, calculate the percent yield of water. Round your answer to 3 significant figures.= _____ %
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02/01/22

A metal sample has a mass of 227.30 g. When placed in a graduated cylinder, the metal sample displaced 84.2 mL. What is the density of the metal?
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01/30/22

What is the solubility of PbF₂ in a solution that contains 0.0550 M F⁻ ions? (Ksp of PbF₂ is 3.60 × 10⁻⁸)
What is the solubility of PbF₂ in a solution that contains 0.0550 M F⁻ ions? (Ksp of PbF₂ is 3.60 × 10⁻⁸)
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01/30/22

2CO 2(g) ↔ 2CO (g) + O 2(g)

0.30 mol of CO 2 is placed in 2.3L reaction vessel and is heated to 2500 ̊C. What would you expect the equilibrium concentration of each entity to be if K for the above reaction is 8.30 x 10 -7 at... more
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01/29/22

How many grams of NH3 can be produced ( theoretically) from the reaction of 5.0g of N2 and 5.0g of H2
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01/18/22

How many moles of copper are needed to react with sulfur to produce 0.25 moles of copper(I) sulfide according to the following reaction: 2 cu + S CuS
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01/18/22

How many moles of potassium oxide (K20) will be formed when 1.52 moles of potassium reacts with oxygen according to the following reaction: 4 K + 02 > 2 KO
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01/18/22

What would be the new volume if the Pressure on 60L is increased from 90KPa to 150KPa? Name the law used (Ans =36L)
What would be the new volume if the Pressure on 60L is increased from 90KPa to 150KPa? Name the law used (Ans =36L)
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01/18/22

An empty beaker has a mass of 251.70 g. When water is added to the beaker, the combined mass is 268.309 g. What is the mass of the water in grams?
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01/17/22

Can anyone please recommend good books for chemistry, physics and biology? ( for a 14-15 year student)
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01/14/22

How many moles of SO2 are required to convert 6.8 g of HaS according to the following reaction? (0.10 g S02) 2 HaS + S02 - 3 S + 2 H20
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01/14/22

need help with homework
At a particular restaurant, each onion ring has 70 calories and each slider has 200 calories. A combination meal with onion rings and sliders is shown to have 1020 total calories and twice as many... more
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01/14/22

Calculate the number of moles of Na¿CS, produced from 0.60 moles of CS2 by the following reaction. (0,40 mol NazCS,) 3 CS2 + 6 NaOH - 2 NazCS3 + NazCOy + 3 H20
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01/14/22

Algorithm - factoring sample size weighted average
I've created an algorithm used to measure season performance across multiple soccer teams. Each team plays a different # of games. I have assigned weights to time periods to calculate a weighted... more
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01/13/22

A 25 mL sample of juice is diluted to 250 mL. A 50 mL aliquot was treated with 20 mL of 0.023M I2; back-titration of the excess I2 required 6.71mL of 0.045M Na2S2O3. M of vit.C in original juice?
C6H8O6 + I2  C6H6O6 + 2H+ + 2II2 + 2S2O3 2-  2I- + S4O6 2-
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01/13/22

What is the pH of the buffer formed by mixing 50 mL of 0.2 M NaH2PO4 with 50 mL of 0.12 M NaOH. ( Ka1(H3PO4)= 7.11x10-3 Ka2(H3PO4)= 6.32x10-8 Ka3(H3PO4)= 4.5x10-13 )
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01/13/22

electrochemistry

Which of the following reacts spontaneously with Mn 2+ according to the redox table? a. Na b. Ag c. Mg 2+ d. Ni
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01/12/22

For the balanced equation shown below, how many moles of CO2 will be produced, if 0.7316 moles of Cl2 are produced? 4C2H3O2Cl+7O2=>8CO2+6H2O+2Cl2
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01/11/22

For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 19.9 moles of methane, CH4 ?
For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 19.9 moles of methane, CH4 ?Round your answer to the nearest tenth. If you answer is a whole number like 4, report... more
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01/11/22

3 Cu  +   8HNO3 → 3 Cu(NO3)2   +  2 NO  +  4  H2O
3 Cu  +   8HNO3 → 3 Cu(NO3)2   +  2 NO  +  4  H2OIn the above equation, how many grams of water can be made when 14.3 moles of HNO3 are consumed? Round your answer to the nearest tenth. If you... more
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01/11/22

A 50.0 mL solution of 0.150 M acetic acid (CH3COOH) is titrated with 0.150 M NaOH. What is the pH after 20.0 mL of base has been added? Ka CH3COOH = 1.8 x 10-5
A 50.0 mL solution of 0.150 M acetic acid (CH3COOH) is titrated with 0.150 M NaOH.What is the pH after 20.0 mL of base has been added? Ka CH3COOH = 1.8 x 10-5
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01/10/22

Why are isotopes radio active?
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01/10/22

Can someone please help me with this Chemistry question

Magnesium metal reacts with hydrochloric acid according to the following equation:Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g)When 0.425 grams of magnesium was added to 150.0 mL of 1.00 M HCl in... more
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