02/04/21

The reaction A+B⟶C+Drate=𝑘[A][B]2 has an initial rate of 0.0720 M/s. What will the initial rate be if [A] is halved and [B] is tripled?
What will the initial rate be if [A] is tripled and [B] is halved?
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02/03/21

2Fe (s) + 3Cl2 (g) —>2FeCl3 (s) What mass of chlorine gas (C1.) needs to be purchesed to be use up 25.7 grams of Iron
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02/03/21

Which of these elements has four valence electrons?

A. hafnium (Hf) B. radon (Rn) C. silicon (Si) D. sulfur (S)I thought that Hafnium and silicon both had four valence electrons in their outer shell, but I can't pick them both.
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02/03/21

When copper metal is added to silver nitrate in solution, silver metal and copper (II) nitrate are produced. What mass of silver is produced from 200.g Cu?
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02/03/21

How many atoms are in 0.188 mol of Na?
How many atoms are in 0.188 mol of Na? (Show your work with unit conversions)
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02/03/21

Chemistry hw ideal gases
Calculate the temperature of a 2.34mol gas having a pressure of 250 KPa at a volume of 22.76L. Consider that is an ideal gas.
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02/03/21

Chemistry hw ideal gases

A 5.6mol sample of neon gas occupies a volume of 67L at 2.25 atm. Calculate the temperature at which this sample would be. Name the law used
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02/03/21

What is the mole fraction of solute in a 3.22 𝑚 aqueous solution?
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02/03/21

What is the mole fraction, 𝑋, of solute and the molality, 𝑚 (or 𝑏), for an aqueous solution that is 19.0% NaOH by mass?
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02/03/21

In a 55.0-g aqueous solution of methanol, CH4O, the mole fraction of methanol is 0.320. What is the mass of each component?
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02/03/21

A solution is made by mixing equal masses of methanol, CH4O, and ethanol, C2H6O. Determine the mole fraction of each component to at least three significant figures.
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02/03/21

A 0.780 𝑚 aqueous solution of KBr has a total mass of 63.0 g. What masses of solute and solvent are present?
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02/03/21

Calculate the molality of a solution formed by adding 8.20 g NH4Cl to 12.2 g of water
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02/03/21

A solution of CaCl2 in water forms a mixture that is 35.0% calcium chloride by mass. If the total mass of the mixture is 497.8 g, what masses of CaCl2 and water were used?
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02/03/21

If Kb for NX3 is 8.5×10−6 , what is the the pKa for the following reaction ?
HNX32 (aq) +H2O (l) ⇌ NX3 (aq) + H3O+(aq)
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02/03/21

If Kb for NX3 is 8.5×10−6, what is the percent ionization of a 0.325 M aqueous solution of NX3?
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02/03/21

If Kb for NX3 is 8.5×10−6, what is the pOH of a 0.175 M aqueous solution of NX3?
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02/03/21

What is the mass of zinc
I’m doing the penny lab and the before mass of the post 1982 penny is 2.54g and the after mass is .23g and now I need to find the mass of zinc
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02/02/21

A 1.6 g sample of solid metal that appears to be gold required 5.8 J of energy to make an 18 ºC temperature change. What is the specific heat of this substance? Is it Gold?

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02/02/21

Determine the amount of energy (heat) in joules required to raise the temperature of 7.40 g water from 29.0 ºC to 46 ºC.

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02/02/21

Molecules and mole ratios

How many molecules of O2 are required to produce 25.0 grams of NO2
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02/02/21

Mole ratios and reactions

How many grams of NO are required completely to react with 15.0 L O2 gas at STP? Be sure to use coefficients.
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02/02/21

What is the solubility of CO₂, in molarity units, in 1.0 L of water when the partial pressure of CO₂ is 1.8 atm?
The Henry's law constant at 25 °C for CO₂ in water is 0.035 M/atm. What is the solubility of CO₂, in molarity units, in 1.0 L of water when the partial pressure of CO₂ is 1.8 atm?
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02/02/21

Chemistry question
Which of the following is considered the salt in the following chemical reaction 2HCl+Ca(OH) 2 CaCl 2 +2H 2 O
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02/02/21

A 2.004-gram sample of calcium is completely reacted with oxygen to produce 2.804 g of calcium oxide. What is the mass percentage of oxygen in calcium oxide?
I got 28.5 percent. Is that correct?
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