428 Answered Questions for the topic chem

Chem Chemistry

04/22/21

What is the [OH-1] concentration if the pH is 11.32?
1.) 2.68 x 10-42.) 0.0021 M3.) 4.79 x 10-9 M4.) 1 x 10-14 M5.) 7.00 x 10-14 M
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04/16/21

Chemistry .
If the total pressure of air is 133 kPa, what is the P O2 if it makes up 22% of the total pressure?
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Chem Chemistry

04/13/21

Why when NH4Cl dissolves in liquid ammonia solution becomes acidic?
When NH4Cl dissolves in:2NH3 ⇌ NH4+ + NH2-shouldn't equilibrium shift to the left since concentration of NH4+ increases resulting in solution becoming basic instead?
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04/13/21

How many grams of potassium chromate are needed to form 36.3 g of potassium nitrate?
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04/13/21

I need help solving equation before midnight! Help, please and thank you very much!
A sample of 568 mL of chlorine gas originally at 25° C was cooled to -25° C. What is thevolume of the cooled gas?
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04/13/21

HELP! I need help solving these chemistry questions before midnight! Please and thank you!
a.A sealed container of an unknown gas has a volume of 2.5 L and a pressure of 5 atm at 25​o​C.How much gas is in the container?b.If the mass of the gas in the container is 40.5 g, what is the... more
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04/13/21

I need help before midnight! Please and thank you!
What ​mass​ of chlorine gas is contained in a 10.0 L container at 27°C and 3.50 atm of pressure?
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04/12/21

quantum numbers
a.) List all of the possible values for l in the 2nd energy level (n = 2). Leave fields blank if they are not needed.
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04/12/21

In the above equation how many moles of water can be made when 180.7 grams of HNO3 are consumed?
S   +   6 HNO3  -->  H2SO4  +  6 NO2  +   2 H2OIn the above equation how many moles of water can be made when 180.7 grams of HNO3 are consumed?Round your answer to the nearest tenth. If you... more
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04/12/21

(Chemistry) Mass-to-Mole Conversion
For the reaction C + 2H2 → CH4, how many moles of hydrogen are needed to make 152.5 grams of methane, CH4 ?Round your answer to the nearest tenth. If you answer is a whole number like 4, report the... more
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04/12/21

In the above equation how many moles of N2 can be made when 188.7 grams of CuO are consumed?
2 NH3  +  3 CuO  --> 3 Cu  +  N2  +   3 H2OIn the above equation how many moles of N2 can be made when 188.7 grams of CuO are consumed?Round your answer to the nearest tenth. If you answer is a... more
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04/12/21

HELP ---> 3 Cu  +   8HNO3  --> 3 Cu(NO3)2   +  2 NO  +  4  H2O
3 Cu  +   8HNO3  --> 3 Cu(NO3)2   +  2 NO  +  4  H2OIn the above equation how many moles of water can be made when 144.1 grams of HNO3 are consumed?Round your answer to the nearest tenth. If you... more
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04/10/21

Common Ion effect: Calculate solubility

The molar solubility of silver phosphate in a 0.259 M silver nitrate solution is _____ M.
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04/09/21

Calculate wavelength
Calculate the wavelength of: a.) an electron (9.10×10-31 kg) moving at a speed of 5.81×106 m/s (13000000 miles per hour).      b.) a baseball (0.140 kg) moving at a speed of 40.2 m/s... more
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04/08/21

Bohr model calculations
Calculate the energy of an electron in the n = 3 level of a hydrogen atom.
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04/08/21

Bohr model calculations
Calculate the energy for the transition of an electron from the n = 8 level to the n = 7 level of a hydrogen atom.E =  ???JoulesIs this an absorption or an emission process?____???_____
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04/08/21

Confused and needing Help with a goof explanation so I understand this better PLEASE

KY.6.EE.9 *1 point
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04/08/21

Confused and needing Help with a goof explanation so I understand this better PLEASE

KY.6.EE.9 *1 point
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04/07/21

Precipitation: Q vs K, Calculate
When 12.0 mL of a 1.73×10-4 M sodium hydroxide solution is combined with 15.0 mL of a 3.79×10-4 M cobalt(II) bromide solution does a precipitate form? (yes or no)For these conditions the Reaction... more
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04/07/21

Need help before April 10th! Please and thank you!
___C6H6+ ___Cl2→ ___C6H5Cl + ___HClWhen 39.0 g of C6H6reacts with an excess of Cl2, the actual yield of C6H5Cl is 42.0 g. What is the percent yield of C6H5Cl?
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Chem Chemistry

04/05/21

The reaction of phosphorus with chlorine to make phosphorus trichloride has a yield of 78%. in order to produce 512 g of phosphorus trichloride how many grams of phosphorus will you need?
P4 + 6Cl2 —> 4PCl3 512.00g 147.90g 656.00g 591.60g 137.50g
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04/05/21

Chemistry Help Please

3Al (s) + 3NH4ClO4 -->Al2O3(s) + AlCl3 (s) + 3NO (g) + 6H2O (l)1)Which reactant is the limiting reactant if 4.25 g of Al is mixed with 5.46 g of NH4ClO4 2)How many grams of Al2O3 can be... more
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04/05/21

Ethalpy reactions
The following reaction is endothermic. MgCl2(s) Mg(s) + Cl2(g)    ΔH(1) = 641 kJ Calculate the enthalpy change for the reaction of the elements to form one mole... more
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04/05/21

Calculate enthalpy change
Given the following two reactions:(1)Pb(s) + Cl2(g)PbCl2(s)     H(1) = -359.4 kJ(2)Mg(s) + Cl2(g)MgCl2(s)     H(2) = -641.3 kJcalculate the enthalpy change for the following reaction:(3) Pb(s) +... more
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04/04/21

Calculate enthalpy
The following reaction is exothermic. N2(g)+H2(g)+3O2(g)=2HNO3(g) deltaH(1)=-270kjcalculate the enthalpy change for the reaction of the elements to form one mole of HNO3(g). 1/2N2(g)+1/2H2(g)+3/2... more
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