02/04/23

Chemistry question
"Silver chloride is soluble in concentrated ammonia forming the complex diamminesilver(I) ion complex, [Ag(NH3)2]+. If the solution containing the complex ion is acidified, silver chloride... more
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02/04/23

Naturally occurring silicon consists of three isotopes with the following isotopic masses and abundances.
IsotopeIsotopic mass (u)Abundance (%) 28Si 27.9769265327 92.2297 29Si 28.97649472 4.6832 30Si 29.97377022 3.0872 Calculate the average atomic mass of naturally occurring silicon to at least... more
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02/04/23

The element carbon has two naturally occurring isotopes. The isotopic masses and abundances of these isotopes are shown in the table.
IsotopeIsotopic mass (u)Abundance (%) 12C 12.00 98.93 13C 13.00 1.07 Calculate the average atomic mass of carbon to two digits after the decimal point. Calculate the average atomic mass of... more
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02/04/23

Which three types of information are needed to calculate an average atomic mass?
The percentage abundance of each isotope.The neutron mass.The proton mass.The masses of the isotopes on the carbon–12 scale.The number of isotopes that exist for the element.The atomic number for... more
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02/03/23

Determine the ΔrH and ΔrU for the reaction
Magnesium metal reacts with acid in solution according to the following reaction:Mg(s)+2H+(aq)→Mg2+(aq)+H2(g)When 0.1021 g of Mg(s) is combined with enough acid solution to make 150.0 g of solution... more
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02/03/23

Find the enthalpy of formation
Under certain nonstandard conditions, oxidation by O2(g) of 1 mol of SO2(g) to SO3(g) absorbs 89.6 kJThe heat of formation of SO3(g) is -204.1 kJ/mol under these conditions.Find the enthalpy of... more
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02/03/23

Chemistry aktiv eq
A 117.5 g piece of copper (specific heat 0.380 J/g･ °C) is heated and then placed into 400.0 g of water initially at 20.7 °C. The water increases in temperature to a final temperature of 22.2 °C.... more
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02/03/23

Buffer system- addition of base

create 25.0 mL of a 0.50M citrate buffer at a pH of 3.2, using Dihydrogen citrate (Ka=1.8x10^-5). For the buffer to work for the purpose needed it must be able to withstand the addition of 1.0 mL... more
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02/03/23

A neutral isotope has a mass number of 65 and 36 neutrons. Identify the element symbol of this isotope and determine the number of protons and electrons.
.element symbol:number of protons:number of electrons:
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02/03/23

A neutral isotope has 49 neutrons and 36 electrons. Identify the element symbol of this isotope and determine the mass number and number of protons.
element symbol:mass number:number of protons:
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02/02/23

Gas Density and Molar Mass
To identify a diatomic gas (X2X2), a researcher carried out the following experiment: She weighed an empty 3.1-LL bulb, then filled it with the gas at 2.01 barbar and 20.0  ∘C ∘C and weighed it... more
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02/02/23

Partial Pressures when volume is doubled
The partial pressures of an equilibrium mixture of N2O4 and NO2 are PN2O4 = 0.34 atm and PNO2 = 1.20 atm at a certain temperature. The volume of the container is doubled. Calculate the partial... more
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02/02/23

What is the overall reaction order for the following rate law: Rate = k[A][B][C]²
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02/02/23

For the reaction A(g) → B(g) + 4 C(g), what is the rate of pressure change for C if the pressure change for A is -0.105 atm/s?
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02/02/23

Net ionic equation

AgNO3(aq)+KCI(aq)=AgCI(s)+KNO3(aq)
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02/02/23

What is the length in meters of 1.00 x 10^2 yards?
Required to show work mathematically.
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02/02/23

How many grams does an 8.50 ounce package weigh?
Required to show work mathematically.
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02/02/23

An adult person has a blood volume of about 5.2 x 10^3 mL. How many pints of blood is this?
Required to show work mathematically.
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02/02/23

Half life with rate order
The half-life for the zero order reaction A → Products is 276 s. What is the value of the rate constant for the reaction if the initial concentration of A is 0.725?
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02/01/23

Chemistry HW help
You have an aqueous solution of NaCI that has a freezing point of - 5.25 °C. What mass (in grams) of NaCI must be added to 1000 g of this solution to lower the freezing point to -12.00 C•?... more
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02/01/23

Osmotic Pressure
Calculate the osmotic pressure of a solution containing 0.936 moles of methanol (CH3OH: nonelectrolyte) in 300. mL of soution at 25.0 degrees celsius. 
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02/01/23

If the mass percent of oxygen in Na2Cr2O7 is 42.8%, what is the mass of oxygen atoms in grams in 12.3 grams of Na2Cr2O7?
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01/31/23

Chemistry Stoichiometry
2Al+6HBr=2AlBr3+3If 8 moles of HBr react, how many grams of Al reacted?
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01/31/23

A sample of NH₃ was placed in a container and heated to 470.0 °C, and the following reaction was allowed to come to equilibrium.
A sample of NH₃ was placed in a container and heated to 470.0 °C, and the following reaction was allowed to come to equilibrium. N₂(g) + 3 H₂(g) ⇌ 2 NH₃(g) The equilibrium concentrations were found... more
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01/31/23

determine the enthalpy of the reaction
The steam reforming of methane occurs according to the following chemical equation: CH₄(g) + 2H₂O(g) ⇌ CO₂(g) + 4H₂(g) Use the following equations to solve for the enthalpy change of steam... more
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