25,963 Answered Questions for the topic chemistry

Chemistry

09/14/23

how to cancel a session
Is there a way to cancel a session or do we need to send a message to the tutor
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Chemistry

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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Chemistry

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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Chemistry

09/14/23

Chemistry: For the following reaction, 15.7 grams of magnesium nitride are allowed to react with 13.2 grams of water.

Magnesium nitride (s) + water (l) —> magnesium hydroxide (aq) + ammonia (aq) What is the maximum amount of magnesium hydroxide that can be formed? Mass=What is the formula for the limiting... more
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Chemistry

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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Chemistry

09/14/23

Chemistry: According to the following reaction, how many grams of water will be formed upon the complete reaction of 28.8 grams of oxygen gas with excess hydrochloric acid?

hydrochloric acid (aq) + oxygen(g) —> water (l) + chlorine (g) Mass= g
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Chemistry

09/14/23

Chemistry: According to the following reaction, how many grams of oxygen gas are required for the complete reaction of 25.5 grams of carbon (graphite)?

carbon (graphite) (s) + oxygen (g) —-> carbon dioxide (g) Mass= grams oxygen gas
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Chemistry

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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Chemistry

09/13/23

Chemistry: According to the following reaction, how many moles of aluminum oxide will be formed upon the complete reaction of 0.694 moles iron(III) oxide with excess aluminum?
iron (III) oxide (s) + aluminum (s) ———> aluminum oxide (s) + iron (s) = moles aluminum oxide
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Chemistry

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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Chemistry

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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Chemistry

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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Chemistry

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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Chemistry

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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Chemistry

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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Chemistry

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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Chemistry

09/13/23

Fill in the missing chemical formulae in the tables below.

Acid Conjugate acid H2PO4- H3O+ H3PO4
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Chemistry

09/13/23

Fill in the missing chemical formulae in the tables below.

Base Conjugate acid SO42- Br- OH-
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Chemistry

09/13/23

Predict the reactants of this chemical reaction.
Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation. Be sure the equation you submit is balanced. (You can edit both sides of the equation to... more
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Chemistry

09/13/23

Calculate the OH- concentration
An aqueous solution at  25 C has a H2O+ concentration of 2. x 10-7 M. Calculate the OH- concentration. Be sure your answer has 1 significant digits. 
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Chemistry

09/12/23

Solution chemistry problem
What volume ( in mL) of a soft drink that is 10.5% sucrose by mass contains 78.5g of sucrose ? (The density of solution is 1.04g/mL )
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Chemistry

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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Chemistry

09/12/23

Chemical reaction
If a solution containing 20 g of lead(II) acetate is allowed to react completely with a solution containing 5 g of sodium sulfate, how many grams of solid precipitate will be formed?mass of solid... more
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Chemistry

09/12/23

chemistry homework
A silver ring is composed of 2.71×1023 atoms.2.71×1023 atoms. Calculate the mass of the ring in grams.
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Chemistry

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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