01/10/22

Can someone please help me with this Chemistry question
Octane, C8H18, a constituent of gasoline burns according to the equation: C8H18(l) + 12.5 O2(g) ---> 8CO2(g) + 9H2O(l)0.1111g of C8H18 was burned in the presence of excess O2 in a bomb... more
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01/09/22

What is the complete chemical symbol for the ion with 42 neutrons, a mass number of 79, and 36 electrons?
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01/08/22

Find the limiting and excess reagent
Silver is expensive. One way to recover silver from waste silver chloride produced in an investigation is to react it with zinc metal in a basic solution: 2 AgCl(s) + 4 NaOH(aq) + Zn(s) →... more
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01/08/22

help! deadline tomorrow )): 2. It is desired to prepare 200 ml of a buffer solution of pH 4.5 from acetic acid, CH3COONa and its salt, sodium actetate, CHCOONa. For CH3COOH, pKa = 4.74. Calculate:
2. It is desired to prepare 200 ml of a buffer solution of pH 4.5 from acetic acid, CH3COONa and its salt, sodium actetate, CHCOONa. For CH3COOH, pKa = 4.74. Calculate:a. the volumes of 0.20M... more
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12/20/21

Calculate the concentration of sodium formate and formic acid when the buffer is at pH = 3.9.
You are preparing 1L of a 250mm formic acid buffer. The pka of formic acid is 3.75. Calculate the concentration of sodium formate and formic acid (each in mM) when the buffer is at pH = 3.9. At pH... more
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12/19/21

In a laboratory experiment, 3.45 g of Sr(NO3)2 is dissolved in enough water to make exactly 750 mL of solution. A 100.0 mL sample of this solution is titrated with a 0.0460 M solution of Na2CrO4-
What volume of Na2CrO4 solution is required to precipitate all of the SrCrO4
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12/16/21

DETERM‎INATION O‎F p‎H OF DIF‎F‎ERENT SOLUT‎IONS
SOLUT‎ION p‎H [H+‎], M pO‎H [OH-‎], M 0.0345 M ‎ Answer 1 - Answer 2 Answer 3 0.0008‎90 M Sr(O‎H)2 Answer 4 Answer 5 Answer 6 - Mixt‎ure of 10‎.0 mL ea‎ch of th‎e 2 solut‎ions... more
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12/14/21

RATES OF REACTION
Consider the overall reaction involving three elements as reactants and compound as the product: X+2Y+2Z ---> XY2Z2. When a series of reactions is performed with different initial... more
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12/13/21

AP Chem equations and reactions summary
Balance the following redox reaction under acidic conditions.MnO4^-1 + SO3^-2 --> Mn^+2 + SO4^-2
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12/12/21

Chem Question about pH

Wh‎ich of the foll‎owing solu‎tions has the high‎est p‎H?A. 5.‎61 x 10-4 M H‎2SO4B. 2.5‎7 x 10‎-4 M Al(O‎H)3C. 3‎.04 x 10-‎3 M H‎NO3D. 1.1‎1 x 1‎0-3 M Ca‎(OH)2
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12/09/21

Calculate the mass of KCl in a 3.35% KCl solution that has a mass of 155.0 g.
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12/06/21

chemistry........
Solid lithium hydroxide is used to remove exhaled carbon dioxide from space vehicles by forming lithium carbonate and liquid water. What mass of carbon dioxide can be absorbed by 30.60 grams of... more
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12/06/21

first year chemistry
If 7.300000000000000 × 10²⁵ molecules of CO₂ are produced in a combustion reaction, how many liters of CO₂ is produced? (The density of CO₂ is 1.98 kg/m³ and 1 L = 1 dm³).
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12/02/21

Chemistry: Basic Gas Laws and Partial Pressure
In 1783, Jacques Charles launched his first balloon filled with hydrogen gas, which he chose because it was lighter than air. The balloon had a volume of 31,000 L when it reached an altitude of... more
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12/02/21

Calculate your calorimeter constant (Ccalorimeter) for Trial 1 and Trial 2.
Trial 1:Mass of cold water: 50.0Temp of cold water: 21.6Mass of hot water: 49.5Temp of hot water : 50.7Temp of mixed water: 38.2Trial 2:Mass of cold water: 49.9Temp of cold water: 22.8Mass of hot... more
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12/02/21

Last question anyone please help
What mass, in grams, of C2H2 is needed to form 157.9 g of CO2? Assume excess oxygen.  2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)  × 10 click to select g C2H2
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11/11/21

How many grams of N2 are made from 32 grams of NH3 ?
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10/11/21

Convert g to mg: Molar mass
Suppose it takes 33.69 mL of 0.005123 M EDTA to titrate 25.00 mL of a hard water solution. e) Convert g CaCO3/L calculated in (d) to mg CaCO3/L. (This is equivalent to ppm.)Enter your answer as a... more
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09/20/21

Calculate the equilibrium concentration of NO(g).
Consider the following equilibrium with Kc = 1.6 × 10–5:  2NOCl(g)  2NO(g) + Cl2(g) 2.00 mole of pure NOCl and 1.808 mole of pure Cl2 are placed in a 2.00-L container. {Remember: you will need to... more
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09/20/21

A reaction mixture contains 0.22 M CH4, 0.67 M CO2 and 1.3 M H2O. Which of the following statements is TRUE concerning this system?
Consider the following reaction and its equilibrium constant: 4 CuO(s) + CH4(g) ⇌ CO2(g) + 4 Cu(s) + 2 H2O(g) Kc = 1.10A. The reaction quotient will increase.B. The equilibrium constant will... more
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08/04/21

I need help, please
Consider the equation.2C2H2+5O2⟶4CO2+2H2OHow many grams of oxygen must be supplied to completely burn  g of acetylene according to the balanced combustion reaction?
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06/28/21

What volume of oxygen gas is produced when 55.7 g of mercury(II) oxide reacts completely according to the following reaction at 25 °C and 1 atm? mercury(II) oxide (s) mercury (l) + oxygen(g)
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06/23/21

A 59.25 g sample of a substance is initially at 28.3 ∘C. After absorbing 2787 J of heat, the temperature of the substance is 133.3 ∘C. What is the specific heat (SH) of the substance? SH=

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06/17/21

calculate the volume gas in litre of 2.57 mole have a pressure of 1.86 atm at a temperature of -12
calculate the volume gas in litre of 2.57 mole have a pressure of 1.86 atm at a temperature of -12
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06/14/21

Calculate the concentrations of [H₃O⁺] and [OH⁻] in the following solutions
4.5 mol/l HCl (strong acid)1.6 mol/l H₂SO₄ (strong, only lose the first proton)0.32 mol/l X(OH)₂ (strong base)0.012 mol/l X(OH)₂ (strong base)
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