04/08/23

Chemistry (Empirical Formula)
Magnesium metal is burned in the presence of atmospheric oxygen to form magnesium oxide.Mass Mg: 0.1773 gMass after reaction: 0.2901 gUsing the given data, calculate the stoichiometric ratio of... more
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04/08/23

Question about state symbols
Question: Q1. What is the difference between aqueous and liquid?Also, how do we determine the state symbols when writing a chemical equation?
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04/07/23

Chemistry: half reaction problem
How much of H2SO4 will be produced after oxydizing 2 kg of pyrite FeS2, which has mass part of iron sulfide of 95.2%.Subsequently, how many litres of 5 mol/l KOH do we need to neutralize the... more
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04/07/23

In red blood cells, hexokinase has a Michaelis constant KM, of approximately 50 μM, and the substrate concentration, [S], is equal to the blood glucose concentration.

In red blood cells, hexokinase has a Michaelis constant KM, of approximately 50 μM, and the substrate concentration, [S], is equal to the blood glucose concentration. Calculate the blood glucose... more
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04/07/23

Chemical reaction problem
A piece of CaCO3 is put into a 1 litre (l) of 1.1 mol/l HCl solution. After whole CaCO3 dissolved, 10 ml of the resulting solution was being titrated with 1.08 mol/l NaOH solution. 1.69 ml of NaOH... more
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04/07/23

50.0 mL of 0.100 M KOH (aq) is titrated with 0.100 M HNO3 (aq). What is the pH... a) initially? b) halfway to the equivalence point? c) at the equivalence point? d) 1 mL past the equivalence point?
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04/06/23

Chemistry Problem Help
Briefly explain how the pH of a 3.0 M solution of K 2 SO 3 should compare to that of a 3.0 M solution of Rb2 SO 3
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04/06/23

Confused about this problem

Hydrazine (N2H4) is one of the combustible components in rocket fuel and also behaves as a monoprotic base with a 𝐾𝑏 = 1.3 × 10^-6 A researcher tries to characterize rocket fuel by identifying the... more
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04/06/23

Predict whether a precipitate will form upon mixing 75.0 mL of NaOH solution with pOH of 2.58 with 125.0 mL of a 0.018 M MgCl2 solution.
I know how to tell whether a precipitate will form, and there is one for this specific reaction. Yet, I am having trouble calculating the Q and Ksp value in order to compare them to each other. I... more
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04/06/23

Chemistry Question help
Given that k is 0.0110 M^-1 s^-1and the [A] is 0.1000 M, determine the rate for this reaction based on the rate law determined. This is for second order reaction
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04/06/23

Need Some Chemistry Help

What is the amount of H+ (aq) ions in 25.0 mL of 0.200 M hydrochloric acid?a. 5.00 molb. 25.0 molc. 0.200 mold. 5.00 mmol e. 25.0 mmol
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04/06/23

For the electrochemical cell 2 Al(s) + 3 Mn²⁺(aq) ⟶ 2 Al³⁺(aq) + 3 Mn(s) (E° = 0.48 V, [Al³⁺] = 1.0 M), what is the value of E when [ Mn²⁺] = 0.050 M? Assume T is 298 K
For the electrochemical cell 2 Al(s) + 3 Mn²⁺(aq) ⟶ 2 Al³⁺(aq) + 3 Mn(s) (E° = 0.48 V, [Al³⁺] = 1.0 M), what is the value of E when [ Mn²⁺] = 0.050 M? Assume T is 298 K
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04/06/23

What is the cell potential for this cell at 25 °C when [Zn²⁺] = 0.0143 M and [Cr³⁺] = 0.1556 M?
Consider a galvanic electrochemical cell constructed using Cr/Cr³⁺ and Zn/Zn²⁺ at 25 °C. The following half-reactions are provided for each metal: Cr³⁺(aq) + 3 e⁻ → Cr(s) E°red = -0.744 V Zn²⁺(aq)... more
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04/05/23

What ratio of CH₃NH₂ to CH₃NH₃⁺ is needed to prepare a pH 10.00 buffer? (Kb for CH₃NH₂ is 4.4 × 10⁻⁴)
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04/05/23

I need help understanding this problem

Nitrogen fixation is the process of converting diatomic nitrogen, which is difficult for organisms to utilize, into ammonia which is much more convenient.N2 (g) + 3 H2 (g) ⇌ 2 NH3 (g)Assume that a... more
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04/05/23

For the galvanic (voltaic) cell Fe(s) + Mn²⁺(aq) ⟶ Fe²⁺(aq) + Mn(s) (E° = 0.77 V at 25 °C), what is [Fe²⁺] if [Mn²⁺] = 0.050 M and E = 0.78 V? Assume T is 298 K
For the galvanic (voltaic) cell Fe(s) + Mn²⁺(aq) ⟶ Fe²⁺(aq) + Mn(s) (E° = 0.77 V at 25 °C), what is [Fe²⁺] if [Mn²⁺] = 0.050 M and E = 0.78 V? Assume T is 298 K
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04/05/23

Limiting reactant, theoretical, percentage yield problem
I'm new to this concept, so it's a little bit confusing.. I need some help. Thanks.A chemist synthesised phosphorous trichloride by mixing 12.0 g of P with 35.0 g Cl2. The limiting reactant is Cl2.... more
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04/05/23

Chemistry step by step
What is the molarity of a solution in which 0.45 grams of sodium nitrate are dissolved in 265 mL of solution?
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04/05/23

if you have 4.6*10^16 atoms of chlorine, how many moles of AlCl3 can be made
Thank you in advance
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04/05/23

Cu(s) + 4HNO3(aq) --> Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l), suppose that you add 5.0 mL of 6 M nitric acid to a sphere of copper metal that weighs 0.58 grams. which reactant is the limiting reagent?
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04/05/23

In the reaction, CaCO3(s)⟶CaO(s)+CO2(g) how many liters of carbon dioxide, CO2, measured at STP, would be produced from the decomposition of 325 g of calcium carbonate, CaCO3?
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04/05/23

When aluminum reacts with concentrated hydrochloric acid, hydrogen gas is produced. 2Al(s)+6HCl(aq)⟶2AlCl3(aq)+3H2(g) What mass of Al(s) is required to produce 717.5 mL of H2(g) at STP?
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04/05/23

45 grams of octane react with oxygen in the air. How many moles of oxygen were consumed in the reaction?
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04/04/23

Complete the balanced molecular reaction for the following weak base with a strong acid:
2 NaClO2 (aq) + H2SO4 ->
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04/04/23

Determine the concentration of copper in the saturated copper (II) tartrate solution.
Saturated Solution: 0.616My equation from graph: 13.389x-0.0342
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