25,990 Answered Questions for the topic chemistry

Chemistry

04/23/23

Chemistry related question

A 1200 mL sample of helium gas is at a pressure of 350 mmH and a temperature of 300 K. What volume will this gas sample occupy if the pressure is increased to 700 mmH and the temperature is... more
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Chemistry

04/23/23

Chemistry related question
The density of a gas is 1.96 g L-1 at 1.00 atm and 0 °C. What is the density of this gas at 0.855 atm and 25.0 C?(A)0.00276 g•L-1(B)0.651 g:L-1(C) 1.54 g.L-1(D) 1.82 g.L-1
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Chemistry

04/23/23

Can someone help me?
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant... more
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Chemistry

04/22/23

Gibbs Free Energy
Given ∆H°= +500 kJ/mol and the equilibrium constant, K = 1 x 10⁻¹⁰ , which of the following is correct concerning the following system at equilibrium at 298 Kelvin? A + B ⇌ C + Da. ∆G = 0b. ∆G° =... more
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Chemistry

04/22/23

Balance the equation in basic conditions. Phases are optional. equation: N_{2}H_{4} + Cu(OH)_{2} -> N_{2} + Cu
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Chemistry

04/22/23

May I get help on this please?

The quantity of antimony in an ore can be determined by an oxidation‑reduction titration with an oxidizing agent. The ore is dissolved in hot, concentrated acid and passed over a reducing agent so... more
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Chemistry

04/22/23

What is the oxidation and reduction reaction for these elements?

Mg(s)+CoBr2(aq)⟶MgBr2(aq)+Co(s)Cu(s)+2AuCl(aq)⟶CuCl2(aq)+2Au(s)
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Chemistry

04/22/23

Can I get help on this please?
For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species. For the reaction N2(g)+3H2(g)↽−−⇀2NH3(g) the standard change in Gibbs free energy is ... more
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Chemistry

04/22/23

May I get help on this?
At 25 ∘C , the equilibrium partial pressures for the reaction 3A(g)+4B(g)↽−−⇀2C(g)+3D(g) were found to be 𝑃A=4.71 atm, 𝑃B=4.26 atm, 𝑃C=5.75 atm, and 𝑃D=4.58 atm. What is the... more
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Chemistry

04/22/23

Can I get help on this?
Calculate Δ𝐺∘ at 298 K for the reaction CS2(l)+3O2(g)⟶CO2(g)+2SO2(g) based on these reactions. C(s)+O2(g)⟶CO2(g)Δ𝐺∘=−397.28 kJ/mol S(s)+O2(g)⟶SO2(g)Δ𝐺∘=−300.19 kJ/mol ... more
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Chemistry

04/22/23

Given the information A+BC⟶2D⟶DΔ𝐻∘Δ𝐻∘=662.4 kJΔ𝑆∘=298.0 J/K=539.0 kJΔ𝑆∘=−172.0 J/K calculate Δ𝐺∘ at 298 K for the reaction A+B⟶2C Δ𝐺∘=

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Chemistry

04/22/23

Chemistry related question

In which gas are the forces between molecules strongest?(A) Ne(B) CH4 (C) О2(D) H2O
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Chemistry

04/22/23

Chemistry related question

A lithium carbide (LixCy) reacts with water as follows:LixCy + H2O -> LiOH + C2H2 (unbalanced)What is the simplest formula of the carbide?(A) LiC(B) Li2C (C) LiC2 (D) Li3C4
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Chemistry

04/22/23

Chemistry related question

Why is the equation incorrect?Mg3 + N2 -> Mg3N2(A) Some of the subscripts are incorrectly used.(B) The equation is not balanced.(C) The valence of the nitride ion is incorrect.(D) The valance of... more
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Chemistry

04/22/23

Chemistry related question

Balance the equation for the reaction, using no fractional coefficients.? Сr2O3+ ? КОН +? О2 -> ? K2CrO4 + ? H2OThe coefficient of KOH in the balanced equation is(A) 2(B) 4(C) 6(D) 8(E)10
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Chemistry

04/22/23

CHemistryyyy pH
NH3 is a weak base (𝐾b=1.8×10−5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.076 M in NH4Cl at 25 °C?
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Chemistry

04/22/23

Mg(OH)2 is dissolved in aq solution has a pH of 8.90 at 25 C. Fill Ice table.
Based off of Provide a equation to find the value of Ksp at 1.0 x 10^-31then find molar solubility of SMg(OH)2= M
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Chemistry

04/22/23

Chemistry Help Please
Calculate the pH and pOH of the solutions with the following hydrogen ion or hydroxide ion concentrations. Indicate whether the solutions are acidic, basic or neutral. Report your answers to 3 sig... more
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Chemistry

04/21/23

Solution calculation worksheet

Consider a solution of 50.0 g of sodium chloride dissolved in 250.0 mL of water. The resulting solution has a volume of 290 mL. Write a chemical equation that would describe the process of sodium... more
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Chemistry

04/21/23

Polar and non polar

N-H POLARC-O POLAR B-F POLARC-H NONPOLAR1) Determine whether the following substances are: ionic, polar covalent molecules, or non-polar For which of the compounds above (if any) would you expect... more
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Chemistry

04/21/23

Chemistry related question

Balance the equation for the reaction, using no fractional coefficients.?P+? HNO3 +? H2O -> ? H3PO4 + ? NOThe ratio of the moles of oxidizing agent to moles of reducing agent in the balanced... more
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Chemistry

04/21/23

Chemistry related question

Complete and balance the equation for the combustion of ZnS in excess oxygen? ZnS +? O2 -> ? ZnO + ?Use no fractional coefficients. The number of moles and the formula of the product containing... more
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Chemistry

04/21/23

Chemistry related question
Chemical equilibrium is the result of (A) a decrease in speed of reaction. (B) the unavailability of one of the reactants. (C) a stoppage of further reaction. (D) opposing reactions attaining... more
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Chemistry

04/21/23

Chemistry related question

The reaction for the formation of ammonia by direct combination is N2 + 3H2 →← 2NH3 ∆H = –92 kJ (A) doubling the concentration of hydrogen (B) reducing the total pressure (C) raising the... more
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Chemistry

04/21/23

Chemistry related question
Given the reaction 2X(g) + Y(g) →← 2Z(g) ∆H = –335 kJ Which combination of pressure and temperature gives the highest yield of Z at equilibrium? (A) 1000 atm and 500 °C (B) 500 atm and 500 °C ... more
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