09/15/23

4.Consider the following solutions: 
Consider the following solutions: 0.010m Na3​PO4​(aq) 0.020m CaBr2​(aq) 0.020m KCl(aq) 0.020m HF(aq) (HF is a weak acid.) a. Which solution(s) would have the same boiling point as 0.040m... more
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09/14/23

Chemistry Stochiometry
A chemist combined chloroform (CHCl3)(CHCl3) and acetone (C3H6O)(C3⁢H6O) to create a solution where the mole fraction of chloroform, 𝜒chloroform,�chloroform, is 0.2190.219. The densities of... more
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09/14/23

Need help with chemistry problem
Perform the calculation and record the answer with the correct number of significant figures. (34.123+9.40) divided by (98.7654−9.357)
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09/14/23

Chemistry: For the following reaction, 4.06 grams of carbon (graphite) are allowed to react with 14.6 grams of oxygen gas
Carbon (graphite) (s) + oxygen (g) —-> carbon dioxide (g)what is the maximum mass of carbon dioxide that can be formed? Mass=What is the FORMULA for the limiting reactant? What mass of the... more
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09/13/23

Chemistry: According to the following reaction, how many grams of hydrochloric acid are required for the complete reaction of 28.7 grams of iron?

iron (s) + hydrochloric acid (aq) —> iron (II) chloride (aq) + hydrogen (g) Mass= g
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09/13/23

Chemistry: According to the following reaction, how many moles of calcium are necessary to form 0.263 moles calcium sulfate?

Sulfuric acid (aq) + calcium hydroxide (s) ———> calcium sulfate (s) + water (l) = moles calcium hydroxide
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09/13/23

Chemistry: According to the following reaction, how many moles of ammonium nitrite are necessary to form 0.298 moles water?

According to the following reaction, how many moles of ammonium nitrite are necessary to form 0.298 moles water?ammonium nitrite (aq) ———-> nitrogen (g) + water (I) = moles ammonium... more
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09/13/23

What is the molar mass of the hydrocarbon?
A solution contains 3.75 g of a nonvolatile pure hydrocarbon in 95 g acetone, (CH3)2CO. The boiling points of pure acetone and the solution are 55.95 °C and 56.50 °C, respectively. The molal... more
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09/13/23

Calculate the mole fraction of pentane in the vapor above the solution
A solution initially contains 2.0 mol of pentane (C5H12) and 12.0 mol of octane (C8H18) at 25 C. The vapor pressures of pure pentane and pure octane at 25 C are 510 torr and 11 torr, respectively.... more
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09/13/23

What is the vapor pressure
Glycerin, C3H8O3, is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 164g glycerin to 338 mL H2O at 39.8 C? The vapor pressure of pure water at 39.8 C is 54.74 torr,... more
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09/13/23

write the rate law for the following elementary reaction
H2(g) + 2I(g) -> 2HI(g)use k1 to stand for a rate constantrate = ___
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09/13/23

complete the table
Each row of the table below describes an aqueous solution at about 25 CComplete the table. That is, fill in any missing entries in the second and third columns. Round your entries for [H3O+] to 2... more
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09/13/23

Fill in the missing chemical formulae in the tables below.

Acid Conjugate acid H2PO4- H3O+ H3PO4
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09/13/23

Fill in the missing chemical formulae in the tables below.

Base Conjugate acid SO42- Br- OH-
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09/12/23

General chemistry freezing point
Camphor boils at 207.4 Celsius. What mass of ethanol (46.07g/mol) dissolved in 675.0 g of camphor will raise the boiling point to 211.6 Celsius?Formula: delta Tb = Kb(constant boiling point... more
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09/12/23

answer the following

A 30.14-g stainless steel ball bearing at 117.82°C is placed in a constant-pressure calorimeter containing 120.0 mL of water at 18.44°C. If the specific heat of the ball bearing is 0.474 J/gC°,... more
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09/12/23

Chemistry answer the question below
A 100-g metal at 110°C is placed in a constant- pressure calorimeter containing 120-g of water at 18°C. If the specific heat of the metal is 0.57 J/gC and the calorimeter is 300 grams at 18°C... more
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09/12/23

Hydrogen in ammonium sulfate, (NH4)2SO4 , a substance used as a nitrogen fertilizer Express your answer using two significant figures.
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09/12/23

Calculate the standard enthalpy of formation of carbon disulfide (CS2) from its elements, given that.
Calculate the standard enthalpy of formation of carbon disulfide (CS2) from its elements, given that.C(graphite) + O2(g)-->CO2(g) ∆H°rxn= -393.5 kJ/molS(rhombic) + O2(g)-->SO2(g) ∆H°rxn=... more
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09/11/23

Charlotte is driving at 53.5 mi/h and receives a text message. She looks down at her phone and takes her eyes off the road for 3.97s. How far has Charlotte traveled in feet during this time?
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09/10/23

To what volume should 5.0 mL of an 2.0 M citric acid solution be diluted in order to obtain a final solution that is 1.50 M? Round to two significant digits.
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09/10/23

A 0.598 g sample of steam at 104.8 ∘C is condensed into a container with 4.91 g of water at 16.7 ∘C. What is the final temperature of the water mixture if no heat is lost?
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09/09/23

Total ionic and net ionic equations
I need help with figuring out the total ionic equations and net ionic equations for: the addition of an acid to a buffer solution of NaHCO3 + Na2CO3 and the addition of a base to a buffer... more
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09/07/23

If a metal block with all sides equal (cube) has a length of 2.23 cm and a mass of 451.43 g, what is the density? Answer in g/mL. Hint: 1 mL = 1 cm3
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09/07/23

I need help with question below
An atom has a diameter of 3.50 Å3.50 Å and the nucleus of that atom has a diameter of 3.50×10−5 Å3.50×10−5 Å. Determine the fraction of the volume of the atom that is taken up by the nucleus.... more
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