10/22/19

Use the bond energies provided to estimate ΔH°rxn for the reaction below. CH3OH(l) + 2 O2(g) → CO2(g) + 2 H2O(g) ΔH°rxn = ?
Use the bond energies provided to estimate ΔH°rxn for the reaction below.                        CH3OH(l) + 2 O2(g) → CO2(g) + 2 H2O(g)            ΔH°rxn = ?Bond         Bond Energy... more
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10/22/19

Chemistry: separation techniques (filtration, crystallization, distillation and chromatography)
I have question about separation techniques.1)what property of food colourings enable them to separated.?2)on the distillate what does the silver nitrate solution indicate?3)the sodium chloride and... more
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10/22/19

Help me solve this question

State the equality: how many moles of uranium are in 41.34 grams of uranium?
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10/22/19

How many grams of sodium hydroxide are present in 252.0 mL of a 0.300 M NaOH solution?
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10/21/19

a 1.9 kg block of iron at 26 degrees Celcius is rapidly heated by a torch such that 15 kJ is transferred to it.
What temperature would the block of iron reach (assuming the complete transfer of heat and no loss to the surroundings)? If that same amount of heat (15 kJ ) was quickly transferred to... more
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10/21/19

draw a lewis dot structure for He
honestly i have no idea what to do
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10/21/19

Determining Order given initial rates
Dibromoethane and potassium iodide react in methanol (the solvent) according to the equation: C2H4Br2 + 3KI → C2H4 + 2KBr + KI3 The initial rate of this reaction was determined in a series of... more
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10/21/19

What is the actual yield of magnesium nitrate?
Assuming an efficiency of 37.30%, calculate the actual yield of magnesium nitrate formed from 132.9 g of magnesium and excess copper(II) nitrate.Mg+Cu(NO3)2 ——-> Mg(NO3)2+Cu
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10/20/19

How much CaF2 (in grams) is formed when 15.7 mL of 0.612 M KF reacts with an excess of aqueous calcium bicarbonate?
How much CaF2 (in grams) is formed when 15.7 mL of 0.612 M KF reacts with an excess of aqueous calcium bicarbonate? Please help me
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10/20/19

The activation energy, Ea, for a particular reaction is 13.6 kJ/mol. If the rate constant at 754 °C is 24.5/min, at what temperature (in °C) will the rate constant be 10.7/min? (R = 8.314 J/mol • K)
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10/20/19

The activation energy for a particular reaction is 102 kJ/mol. If the rate constant is 1.35 × 10⁻⁴ s⁻¹ at 308 K, what is the rate constant at 273 K?
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10/20/19

Explanation of Ion charges

For my chemistry class, I need to memorize all of the ion charges. However, first, I need to understand them and the way my teacher explained them did not help. How do ionic charges work and what... more
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10/20/19

A copper ring is composed of 6.02 X 10^22 atoms. Calculate the mass of the ring in grams.
Mass: ________________ g
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10/20/19

Calculate the number of atoms in a 3.44 X 10^3 g sample of lithium.
Answer: ___________ atoms
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10/20/19

How many atoms are in 4.57 mol of pure aluminum?
Answer: ______________Al atoms
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10/20/19

Convert 1.27 X 10^24 atoms of carbon to moles of carbon

1.27 X 10^24 atoms=_________________ mol C
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10/20/19

How many grams of potassium dihydrogen phosphate (KH2PO4) are there in 0.659 mol?
0.659 mol= _____________g
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10/20/19

How many moles of carbon disulfide (CS2) are in 42.5 g of the compound?
Moles of carbon disulfide:____________mol
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10/20/19

How many moles of argon are in 36.2 g of argon?

Answer: ______________mol
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10/20/19

All the following are state functions except A. ∆E. B. PV. C. ∆H. D. q.
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10/20/19

According to the following reaction, how much energy is evolved during the reaction of 0.111 mol B2H6 and 0.252 mol Cl2 (Both gases are initially at STP)?
According to the following reaction, how much energy is evolved during the reaction of 0.111 mol B2H6 and 0.252 mol Cl2 (Both gases are initially at STP)? The molar mass of B2H6 is 27.67... more
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10/20/19

A sample of copper absorbs 43.6 kJ of heat, resulting in a temperature rise of 75.0°C, determine the mass (in kg) of the copper sample if the specific heat capacity of copper is 0.385 J/g°C.

A sample of copper absorbs 43.6 kJ of heat, resulting in a temperature rise of 75.0°C, determine the mass (in kg) of the copper sample if the specific heat capacity of copper is 0.385... more
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10/20/19

I need help with two science questions.

How many moles of O2(g) are required to react with 2 mol C6H6(l) to produce 12 mol CO2(g) and 6 mol H2O(g)?How many moles of O2(g) are required to react with 4 mol C6H6(l) to produce 24 mol... more
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10/20/19

What is the solubility in moles/liter for calcium sulfate at 25 oC given a Ksp value of 2.4 x 10-5.
What is the solubility in moles/liter for calcium sulfate at 25 oC given a Ksp value of 2.4 x 10-5.The answer is: 4.9e-3please explain and show your steps
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10/20/19

The Ksp of Al(OH)3 at 25 oC is 1 x 10-33. Consider a solution that is 1.0 x 10-10 M in Al(NO3)3 and 1.0 x 10-8 M in NaOH.
The Ksp of Al(OH)3 at 25 oC is 1 x 10-33. Consider a solution that is 1.0 x 10-10 Min Al(NO3)3 and 1.0 x 10-8 M in NaOH.the answer is: Q < Ksp and a precipitate will not formplease explain
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