01/25/23

Reaction Stoichiometry

If 10.0 g of calcium hydroxide were reacted with 6.561 g of hydrochloric acid, according to the equation given :Ca(OH) 2 (s) + HCl (aq) —CaCl2 (aq) + H2O (1)#1.) Which reagent acts as Limiting... more
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01/25/23

Reaction Stoichiometry

If 10.0 g of calcium hydroxide were reacted with 6.561 g of hydrochloric acid, according to the equation given :Ca(OH) 2 (s) + HCl (aq) —CaCl2 (aq) + H2O (1)#1.) Which reagent acts as Limiting... more
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01/25/23

What is the vapor pressure of ethanol (in mmHg) at 34.9 °C if its vapor pressure is 400.0 mmHg at 63.5 °C? (∆Hvap = 39.3 kJ/mol; R = 8.314 J/K • mol)
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01/25/23

A gas mixture contains 17.3% hydrogen and 82.7% argon by mass. What is the partial pressure of argon in the mixture if the total pressure is 987 mbar ?
Express the partial pressure in millibars to three significant figures.
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01/25/23

Calculate the mass percent composition for each of the following compounds. Express your answers using one decimal place by a comma.
a.) 0.425 g of C and 0.043 g of H
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01/24/23

1a) What volume of 3.00 mol L−1 HCl in litres is needed to react completely (with nothing left over) with 0.500 L of 0.100 mol L−1 Na2CO3 ?
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01/24/23

The mass of a single molybdenum atom is 1.59×10-22 grams. How many molybdenum atoms would there be in 331 milligrams of molybdenum?
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01/24/23

The activation energy for the gas phase isomerization of dimethyl citraconate is 105 kJ. The rate constant at 685 K is 9.67x10^-4. The rate constant will be at 731 K.
Please give steps, Include how to solve for ln(k2/k1)
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01/24/23

What dosage in g/kg of body weight does a 160. lb man receive if he takes three 200. mg tablets of ibuprofen? How many 100. mg tablets should a 40. lb child take to receive the same dosage?
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01/24/23

liquid ethanol combustion in air. write the balanced chemical equation and identify the elements that are oxidized and reduced with the appropriate oxidation numbers. How do you do that?
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01/23/23

Phase transitions
A 0.514 g sample of steam at 105.9 ∘C is condensed into a container with 4.93 g of water at 15.6 ∘C. What is the final temperature of the water mixture if no heat is lost? The specific heat of... more
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01/23/23

Specific heat capacity
5.21 g of MgSO₄ is placed into 100.0 mL of water. The water's temperature increases by 6.70 °C. Calculate ∆H, in kJ/mol, for the dissolution of MgSO₄. (The specific heat of water is 4.184 J/g･ °C... more
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01/23/23

Chemistry Prelab
Pure benzaldehyde (C7H6O) has a normal boiling point of 178.10 °C. A solution of 24.6 g of fluorescein (C20H12O5) in 128 g of benzaldehyde has a boiling point of 180.58 °C. Calculate... more
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01/22/23

What distance does electromagnetic radiation travel in 7.50 msec?
What distance does electromagnetic radiation travel in 7.50 msec?I got 2250000m, but apparently, I'm wrong. Please help.
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01/22/23

Could I have some help with this chemistry problem?
The combustion of octane,C8H18, proceeds according to the reaction shown.2C8H18(l)+25O2(g)⟶16CO2(g)+18H2O(l)If 5.70×10^2 mol of octane combusts, what volume of carbon dioxide is produced at 34.0 ∘C... more
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01/22/23

If you had Pr6O11 + HNO3 and want to form Pr(NO3)3 * 6H2O, how would you figure out the number of grams of Pr6O11 and HNO3 you need?
If you had Pr6O11 + HNO3 and want to form Pr(NO3)3 * 6H2O, how would you figure out the number of grams of Pr6O11 and HNO3 you need to form the Pr Nitrate Hexahydrate?Assume the HNO3 is 68%.Pr6O11:... more
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01/21/23

What is the formula for ammonium sulfide? Capitalization and punctuation count. How many hydrogen atoms are in 3.00 mol of ammonium sulfide?
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01/21/23

Mystery Yellow Dye
When cleaning a laboratory, you find a bottle with a label reading “Yellow dye, ϵ = 1.07x104 (cm-1⋅M-1)”. When 7.0 mg is dissolved in 295 mL, an absorbance of 0.553 was found. What is the molecular... more
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01/20/23

(COOH)2 titration by NaOH
Suppose that 0.242g of oxalic acid(COOH)2, is dissolved in 50ml of water.a) estimate the ph of this solution.b) Estimate the ph of the solution that results when 15ml of 0.150M NaOHaq is added to... more
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01/20/23

A 18.0 wt% solution of CaCl2 ( 110.98 g/mol) has a density of 1.165 g/mL. What is the mass, in milligrams, of a 20.0 mL solution of 18.0 wt% CaCl2 ?
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01/20/23

Hydrogen Peroxide to mol
The disinfectant hydrogen peroxide (H2O2) decomposes to form water and oxygen gas. How much O2 will result from the decomposition of 3.47 mol of hydrogen peroxide?
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01/19/23

Give the formula for tetrasilicon heptabromide.
Give the formula for tetrasilicon heptabromide.
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01/19/23

Consider a 0.78 M solution of NH3 (Kb = 1.8×10-5). calculate the pH
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01/19/23

Rank the following acids in strength (from weakest to strongest). A ) HC2H3O2 B) HOCl C) HCN D) HCl
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01/19/23

Which of the following bases have weak conjugate acids? a) C3H5O2- b) NH3 c) NO2- d) NO3-
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