10/05/22

Solubility in water
Which of the following salts are soluble in water (in amounts greater than 1 g per 100 g of water)?Fe(NO3)3(NH4)2CO3MgCO3Hg2ICuCl2
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10/05/22

Determine the energy of 1.80 mol of photons for each of the following kinds of light. (Assume three significant figures.)
Determine the energy of 1.80 molmol of photons for each of the following kinds of light. (Assume three significant figures.)infrared radiation (2490 nmnm ) =visible light (480 nmnm ) = ultraviolet... more
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10/05/22

C3H8(g)+5O2(g)→3CO2(g)+4H2O(g). Calculate ΔrH∘ for this reaction using standard enthalpies of formation. (The standard enthalpy of formation of gaseous propane is -103.85 kJmol−1 .)
C3H8(g)+5O2(g)→3CO2(g)+4H2O(g). Calculate ΔrH∘ for this reaction using standard enthalpies of formation. (The standard enthalpy of formation of gaseous propane is -103.85 kJmol−1 .)
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10/05/22

What is the answer?
Step 1: How many moles of NaOH are present in 28.0 mL of 0.160 M NaOH?moles of NaOH:
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10/05/22

In the reaction 551.00 moles of copper (2)nitrate, how much product is produced of copper (2) oxide in grams, nitrogen oxide in grams, and molecular oxygen in grams?
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10/05/22

Calculate mass of "air" (in grams) in the container, given that air is approximately 21% O2 and 79% N2. 
During an experiment, a 25.0mL "empty" sealed container is placed on a balance and found to have a mass of 12.730g. The pressure and temperature in the room is measured to be 0.997 atm and 19.5°C,... more
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10/05/22

Question on CHEM HW
Hi I was attempting this problem earlier but I got it incorrect I would like to know where I went wrong.Suppose you are investigating the reaction: M(s) + 2 HC|(aq) › MCl2(aq)+H2(g).You weigh out a... more
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10/05/22

chem homework help
A sample of 6.35 g6.35 g of liquid 1‑propanol, C3H8O,C3H8O, is combusted with 43.7 g43.7 g of oxygen gas. Carbon dioxide and water are the products.Write the balanced chemical equation for the... more
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10/04/22

Determine the Mass
Determine the mass (in units of grams) of a nonvolatile, nonionizing compound that must be added to 4.79 kg of water to lower the freezing point to -1.3°C if the molar mass of the compound is 50.0... more
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10/04/22

How do you find the answer?
A student has 7.15 g of zinc powder, 1.30 L of a 3.00 M calcium nitrate solution, and 1.80 L of a 3.40 M lead(II) nitrate solution.Write the chemical reaction that occurs between the two reacting... more
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10/04/22

What is the concentration?
Write the balanced neutralization reaction that occurs between H2SO4 and KOH in aqueous solution.Suppose 0.150 L of 0.490 M H2SO4 is mixed with 0.100 L of 0.300 M KOH. What concentration of... more
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10/04/22

Finding the theoretical yield and actual yield?
Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese(IV) oxide.4HCl(aq)+MnO2(s)⟶MnCl2(aq)+2H2O(l)+Cl2(g)A sample of 34.9 g MnO2 is added to a solution... more
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10/04/22

What is the percent yield?
Consider the reaction.2Pb(s)+O2(g)⟶2PbO(s)An excess of oxygen reacts with 451.4 g of lead, forming 352.5 g of lead(II) oxide. Calculate the percent yield of the reaction.percent yield:
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10/04/22

Hi, I would like some help with my chemistry problem.
The question is: Consider the double replacement reaction between magnesium sulfate and potassium bromide. If a reaction vessel contains 5.02g of magnesium sulfate and 9.89g of potassium bromide,... more
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10/03/22

How far away, in kilometres, is Sirius from the sun?
The distance from our sun to Sirius, the brightest star of the night sky, is 8.6 light years. A light year is the distance that light travels in one year (365 days).
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10/03/22

If you combine 440.0 mL of water at 25.00 ∘C and 140.0 mL of water at 95.00 ∘C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
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10/03/22

q=mc(deltaT) final temp
A hot lump of 45.345.3 g of aluminum at an initial temperature of 83.6 °C83.6 °C is placed in 50.0 mL H2OH2O initially at 25.0 °C and allowed to reach thermal equilibrium. What is the final... more
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10/03/22

Express your answer as a chemical equation

Sodium chloride and lead(ll) nitrate
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10/03/22

Theoretical yield

Liquid octane (CH3(CH2)6CH3) reacts with gaseous oxygen gas (o2) to produce gaseous carbon dioxide (CO2) and Garoua water H2O what is the theoretical yield of carbon dioxide formed from the... more
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10/02/22

How many atoms are in 0.0500 moles of magnesium?

How many atoms are in 0.0500 moles of magnesium? 
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10/02/22

Predict the products (if any) that will be formed by the reaction below.

If no reaction occurs, write NR after the reaction arrow. Be sure to include the proper phases for all species within the reaction.FeSO₄(aq)+Zn(s)→?
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10/02/22

The iron content of iron ore can be determined by titration with KMnO₄.
8H⁺(aq) + MnO₄⁻(aq) + 5Fe²⁺(aq) → 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O(l) A sample of iron ore with a mass of 1.535 g was dissolved with HCl and then treated with a reducing agent to convert any Fe³⁺ in the... more
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10/02/22

Predict the products (if any) that will be formed by the reaction below.
If no reaction occurs, write NR after the reaction arrow. Be sure to include the proper phases for all species within the reaction.Ni(s)+HI(aq)→?
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10/02/22

Molarity and Concentration
A 77.0 mL77.0 mL portion of a 1.30 M1.30 M solution is diluted to a total volume of 258 mL.258 mL. A 129 mL129 mL portion of that solution is diluted by adding 143 mL143 mL of water. What is the... more
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10/02/22

What mass (in grams) of fluorine gas is needed to react completely with 17.8 g of elemental sulfur, S8, to form sulfur hexafluoride SF6?
What mass (in grams) of fluorine gas is needed to react completely with17.8 g of elemental sulfur, S8, to form sulfur hexafluoride SF6?S8 (g) +24F2 (g) -> 8 SF6 (g)
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