01/15/21

The initial concentration of a reactant in a first order reaction is 0.860 M. What will be its concentration after 4 half-lives have passed?
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01/15/21

An experimental plot of ln(k) vs. 1/T is obtained in lab for a reaction. The slope of the best-fit line for the graph is -2610 K. What is the value of the activation energy for the reaction in kJ/mol?
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01/15/21

The activation energy Ea for a particular reaction is 42.2 kJ/mol. How much faster is the reaction at 343 K than at 319 K? (R = 8.314 J/mol • K)
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01/15/21

Gas Stoichiometry
The volume of a sample of pure HCl gas was 189 mL at 25 degrees Celsius and 108 mm Hg. It was completely dissolved in about 60 mL of water and titrated with an NaOH solution; 15.7 mL of the NaOH... more
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01/15/21

Helpp PLZ urgentt

1. A compound contains 46.7% nitrogen and 53.3% oxygen. If the molecular mass of the compound is 60.0 g/mol, what is the molecular formula? 2. A compound is found to contain 24.8% carbon, 2.0%... more
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01/15/21

Find pH of mixture

There is a case in which 0.025 litres of a solution containing 2.0M of HCl is combined with a 0.040 litres of solution containing 0.25M of Mg(OH)2. Using this information, what is the pH of the... more
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01/14/21

A compound was found to contain 33.0% Si and 67.0% F by mass if the molar mass of the compound is 340 g/mol calculate its molecular formula
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01/14/21

Chemistry Equilibrium (Can Someone Answer This)
Methanol, CH3OH, is manufactured industrially by the reactionCO(g) + 2H2(g) <--------> CH3OH(g)A gaseous mixture at 500K initially is 0.020 M CH3OH, 0.10 M CO, and 0.10 M H2. Will... more
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01/14/21

Chemistry Equilibrium (Can Someone Answer This)
The value of Kp for the equilibriumCOCl2(g) <--> CO(g) + Cl2(g)is 6.7 E-4 at a certain temperature. If the initial partial pressure of COCl2(g) is 0.87 atm a. What will be the... more
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01/14/21

Titration problems
A student performs a titration to determine the concentration of a solution of nitric acid, HNO3. The student starts with 45.0 mL of the acid in a flask and titrates it against a standard solution... more
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01/14/21

Equilibrium Chemistry (Can Someone Solve This)
2H2Cl(g) <--> 2H2(g) + Cl2(g)A 4.30 g sample of H2Cl(g) is introduced into an evacuated rigid 1.50 L container. Upon heating to 423 K, hydrogen chloride gas decomposes, and 0.0130 moL of... more
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01/14/21

A 2.241 g sample of zinc reacts with oxygen to form 2.789 g of the metal oxide.
calculate the empirical formula for oxide
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01/13/21

Zinc metal reacts with silver (l) nitrate to form silver and zinc (II) nitrate
Write appropriate formulas from the word equations. Balance the equation and highlight the coefficients.
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01/13/21

Green light has a wavelength of 522 nm. Calculate the energy of one photon of green light in Joules.

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01/13/21

Empirical Formula Practice

Lactic acid, employed in pharmaceutical technology to produce water-soluble lactates, has the following elemental composition: C, 40.00 ; H, 6.71 ; O, 53.29 .Calculate the empirical formula of... more
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01/13/21

Find the frequency (ν); the wavelength (λ); and the energy (E) of the KSL-AM radio station 1160 kHz.
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01/13/21

Empirical Formula Practice
A compound containing tellurium and fluorine is decomposed in the laboratory and produces 3.605  of tellurium and 3.221  of fluorine.Calculate the empirical formula of the compound.    Express your... more
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01/13/21

Molecular Formula Notes Check

Consider:Acetylene, a gas used in welding torches, has the empirical formula of CH and a molar mass of 26.04 g/mol. The FORMULA MASS of the empirical formula is ____ g/mol.
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01/13/21

Chemistry Percent Yield HW question!! help pls
 2K + CaF2 → 2KF + CaWhat is the percent yield if 10g of CaF2 reacted to produce 12.2g of KF actually in the lab? (Answer = 81.98%)Given: 10g of CaF2Unknown: mass of KF (12.2 is the actual mass and... more
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01/13/21

Oxygen gas and water are produced by the decomposition of hydrogen peroxide (h2o2). If 10.0 mol of h2o2 decomposes, what volume of oxygen will be produced?
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01/13/21

Chemistry weak bases
Trimethylamine, (CH3) 3N is a weak base (Kb = 6.3 × 10–5). What volume of this gas, measured at STP, must be dissolved in 2.5 L of solution to give that solution a pOH of 2.50?
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01/13/21

Given the air in a building has a density of 1.184x10^-3 g*cm^-3, how much does the air weigh(in pounds) in a room measuring 30.0 ft and 7.0 in wide by 41.0 ft long by 9.00 ft high?
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01/13/21

The rate of the reaction NO2 + CO → NO + CO2 depends only on the concentration of NO2. The following data were collected:
The rate of the reaction NO2 + CO → NO + CO2 depends only on the concentration of NO2. The following data were collected: Time (s) [NO2]0 (M) 0  0.500 1.20 x 103  0.444 3.00 x... more
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01/13/21

Any help with these chem problems would be awesome
Consider 100.0 mL solutions of ammonia (NH3) and sodium hydroxide (NaOH), each with a concentration of 0.100 M.    (a)Qualitatively compare the pH values of these two solutions. Support your... more
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01/12/21

I'm new to chemistry and I need help with this
A chemist starts with a 50.0 mL sample of 0.265 M propanoic acid, HC3H5O2, then adds 0.496 g of sodium propanoate, NaC3H5O2.1.Explain how this creates an effective buffer.2.Propanoic acid has an... more
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