02/21/23

The formation constant* of [M(CN) 2 ]− is 5.30×1018 , where M is a generic metal. A 0.150 mole quantity of M(NO3) is added to a liter of 0.680 M NaCN solution.
What is the concentration of M+ ions at equilibrium?
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02/20/23

What is the pH of a buffer made from 0.580 mol of CH₃NH₂ (Kb = 4.4 × 10⁻⁴) and 0.230 mol of CH₃NH₃I?
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02/20/23

What is the calcium ion concentration in a solution prepared by mixing 447 mL of 0.407 M calcium nitrate with 467 mL of 0.363 M sodium fluoride? The 𝐾sp of calcium fluoride is 3.45×10−11. [Ca2+] =?
What is the calcium ion concentration in a solution prepared by mixing 447 mL of 0.407 M calcium nitrate with 467 mL of 0.363 M sodium fluoride? The 𝐾sp of calcium fluoride is 3.45×10−11. [Ca2+] =?
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02/19/23

Final temp if no heat is lost
A 0.515 g0.515 g sample of steam at 105.7 ∘C105.7⁢ ∘C is condensed into a container with 4.59 g4.59 g of water at 16.7 ∘C.16.7⁢ ∘C. What is the final temperature of the water mixture if no heat is... more
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02/19/23

The 𝐾sp of calcium hydroxide, Ca(OH)2 , is 5.50×10−6 and its density is 2.20 g/mL . Calculate 𝐾c for the dissolution of this hydroxide. 𝐾c=

The 𝐾sp of calcium hydroxide, Ca(OH)2 , is 5.50×10−6 and its density is 2.20 g/mL . Calculate 𝐾c for the dissolution of this hydroxide. 𝐾c=
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02/19/23

If the caffeine concentration in a particular brand of soda is 3.91 mg/oz, drinking how many cans of soda would be lethal?

Assume that 10.0 g of caffeine is a lethal dose, and there are 12 oz in a can.
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02/18/23

chemistry acids and bases
Find the pH and the concentrations of all species (other than water) in the following solutions at 25 °C: (a) 0.30 M HNO3; (b) 0.30 M NaOH; (c) 4.2 × 10−3 M HClO4; (d) 2.9 × 10−4 M Ca(OH)2; (e) 1.0... more
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02/18/23

Chemistry HW Help
Calculate the pH when 56.0 mL of 0.250 M HCI is mixed with 40.0 mL of 0.150 M Ca(OH)2.
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02/18/23

Chemistry HW help
Calculate the pH when 33.0 mL of 0.150 M KOH is mixed with 20.0 mL of 0.300 M HBrO (Ka = 2.5 x 10^-9
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02/18/23

Chemistry HW help
A student titrated 30.00 mL of a weak base solution, 0.150 M CH3NH2 (Kb = 4.40 × 10^-4), with 0.100 M HCI solution. Calculate the pH at the equivalence point.
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02/18/23

Chemistry HW help
What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10^-4) and 0.200 mol of NaF to which 0.110 mol of HCI were added?
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02/18/23

Chemistry HW Help
What ratio of NaCN to HCN is needed to prepare a pH10.30 buffer? (Ka of HCN is 4.9 × 10^-10)
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02/18/23

Chemistry Question
An element has three stable isotopes. Isotope 1 has a mass of 145.8975 amu and an abundance of 0.18750. Isotope 2 has a mass of 146.8756 amu and an abundance of 0.33750. Isotope 3 has a mass of... more
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02/18/23

An empty steel container is filled with 4.40 atm of H₂ and 4.40 atm of F₂. Question continues below:
An empty steel container is filled with 4.40 atm of H₂ and 4.40 atm of F₂. The system is allowed to reach equilibrium. If Kp = 0.450 for the reaction below, what is the equilibrium partial pressure... more
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02/18/23

Can you help answer a,b and c please

Given the following reaction mechanism, 2 NO2Cl <—> ClO2 + N2O + ClO (fast equilibrium) N2O + ClO2 <—> NO2 + NOCl (fast equilibrium) NOCl + ClO -> NO2 + Cl2 (slow) a) What is the... more
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02/17/23

Write the rate law for the two elementary reaction equations. 2A(g)+B(g)⟶C(g)+D(g) and X(g)+Y(g)⟶Z(g) rate=k?
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02/17/23

The reaction C4H8(g)⟶2C2H4(g) has an activation energy of 262 kJ/mol. At 600.0 K, the rate constant, 𝑘, is 6.1×10−8 s−1. What is the value of the rate constant at 805.0 K? k=s^-1
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02/17/23

After 79.0 min, 39.0% of a compound has decomposed. What is the half‑life of this reaction assuming first‑order kinetics? t1/2=minutes?
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02/17/23

The rate constant for this first‑order reaction is 0.0130 s−1 at 400 ∘C. A⟶products After how many seconds will 18.5% of the reactant remain? t=s?
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02/17/23

At a certain temperature, Kp is 0.00305 for the reaction: N2(g) + 3 H2(g) ⇌ 2 NH3 (g). What is the value of Kp for the following reaction? NH3 (g) ⇌ 1/2 N2(g) + 3/2 H2(g)
This is the answer: 1.81E1I just don't understand
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02/17/23

If you react excess CuSO4 and 24.0 mL of NH3 (density = ), how many moles of Cu(NH3)4SO4 can be produced?

If you react excess CuSO4 and 24.0 mL of NH3=), how many moles of Cu(NH3)4SO4.Density=(0.860g/1 ml)Please Show work, thank you.
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02/17/23

If a buffer solution is 0.180 M in a weak base ( 𝐾b=2.9×10−5) and 0.460 M in its conjugate acid, what is the pH?

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02/17/23

If a buffer solution is 0.210 M in a weak acid ( 𝐾a=3.1×10−5) and 0.550 M in its conjugate base, what is the pH?

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02/17/23

A samp;e of an alloy has a specific heat of 2.4
a sample of an alloy that has a specific heat of 2.4 J/g*K is heated from 293K to 343K it absorbs 45.8kj of energy what is the mass of the sample in grams?
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02/17/23

chemistry stoichiometry
combustion of C5H12 produced 34.2 L of water vapor at 25 degrees celsius and 725 mm Hg. how many grams of C5H12 reacted ?
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