11/03/21

A generic solid, X, has a molar mass of 60.8 g/mol. In a constant‑pressure calorimeter, 17.7 g of X is dissolved in 333 g of water at 23.00 °C. X(s)⟶X(aq)

The temperature of the resulting solution rises to 27.30 °C. Assume the solution has the same specific heat as water, 4.184 J/(g·°C), and that there is negligible heat loss to the surroundings.How... more
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11/02/21

What is the number of formula units in a 2.57 mole sample of FeCl3
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11/02/21

Can someone please help me with this? I would really appreciate it!
Which rule concerning oxidation numbers is NOT true?A. Fluorine always has an oxidation number of –1 in molecules that contain two or more types of atoms.B. Oxygen has an oxidation number of –2 in... more
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11/02/21

AP CHEMISTRY DILUTIONS
Outline the correct laboratory procedure for diluting a stock solution of 18.4 M sulfuric acid to produce 1.0 L of 1.84 M sulfuric acid. Take care to include any calculations, safety procedures,... more
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11/02/21

How much energy is required to melt 500g of water?
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11/02/21

When an electron in a hydrogen atom falls from n = 5 → n = 2, the amount of energy the electrons carries is - 4.20 x 10-19 J.

What is the energy of the photon of light? What is the energy in Joule/mol of photons?
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11/02/21

AP CHEMISTRY GAS LAWS ll
What volume of oxygen, at STP, is required to burn exactly 11.60 L of methane (CH4) according to the reaction below?CH4 (g) + O2 (g) --> CO2 (g) + H2O (I)
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11/02/21

Using drawings, show the inverse relationship between wavelength and frequency. Label the wavelength on each drawing and describe the frequency of each wave.
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11/02/21

Green light has a lower frequency than blue light. Which color light has a longer wavelength? Why?

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11/02/21

Finding molecular weight
A liquid was vaporized which had a total of 165mL at 100°C, and 754 torr. The mass of the vapor was .38g. What’s the molecular weight of this liquid?
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11/02/21

From the following formula for a progesterone nasal spray, calculate the quantity of each ingredient needed to prepare twenty- four 15-mL containers of the spray.
Progesterone 20 mgDimethyl-b-cyclodextrin 62 mgPurif ed water, ad 1 mL
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11/02/21

From the following formula or 40 sertraline hydrochloride capsules, calculate the quantity o each ingredient needed to prepare 250 such capsules.
(involving reducing and enlarging formula)Sertraline hydrochloride 300 mgSilica gel 6 gCalcium citrate 4 g
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11/02/21

What is the molecular of a compound if it has a molar mass of 60.00 g/mol and have an empirical formula of CH4N?
Solution and answer the question
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11/02/21

For the given reaction, what volume of NO2Cl can be produced from 3.3 L of Cl2 , assuming an excess of NO2 ? Assume the temperature and pressure remain constant. 2NO2(g)+Cl2(g)⟶2NO2Cl(g)
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11/02/21

The planet earth has a volume of 1.1 x 1021 m³ and an average density of 5.5 g/cm³. What is the mass of earth in kilograms?
The planet earth has a volume of 1.1 x 1021 m³ and an average density of 5.5 g/cm³. What is the mass of earth in kilograms?
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11/02/21

Thermochemistry. Answer, step by step please. (show work)
1) 2C (s) + 2H2 (g)  1C2H4 (g) ∆H = 52.3 kJ a. Is this exothermic or endothermic?b. Rewrite the equation with the energy as either a reactant or a product.c. What volume of Ethene gas can be... more
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11/01/21

Please help 2 Chemistry problem In description below!

If 9.50 L of a gas is at standard temperature and pressure is compressed to 956mL, what is the new pressure of the gas in atm (hint, temperature stays thesame)?Submarines need to be extremely... more
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11/01/21

In the reaction below, if a total of 10.0 g of zinc and hydrochloric acid react completely, what is the total mass of zinc chloride and hydrogen produced? Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

help! this is really confusing
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11/01/21

Enthalpy and Calorimetry
The molar enthalpy of a solution of ammonium chloride is +14.8 KJ/mol. What would the final temperature of a soliton in which 40g of ammonium chloride is added to 200.00mL of water, initially the... more
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11/01/21

-------CHEMISTRY------------
Explain the mechanism of catalyst in increasing and decreasing the rate of chemical reaction.
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10/31/21

Predict the major and minor products of the reaction. Name the products using systematic names.
CH3CH2CH=CH2+H2O−→−H+
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10/31/21

Intro to Chem Question
A solution contains an unknown amount of dissolved magnesium. Addition of 0.0877 mol of Na2CO3 causes complete precipitation of all the magnesium. What is the maximum mass of magnesium that was... more
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10/31/21

Need help right away
A car engine has a liquid coolant with a specific heat capacity of 3.75 J/(g•°C). The mass of coolant that will absorb 1.10 MJ of heat during a temperature rise from 22°C to 108°C is a.b kg.A hot... more
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10/31/21

(Molarity) Using the same approach calculate how many milliliters of 0.140 M NaOH are needed to completely neutralize 27.4 mL of 0.398 M H2C4H4O6.
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10/31/21

What is the following signa to English?
"gtt ii a.s. stat, gtt 1 q 6 prn pain".
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