447 Answered Questions for the topic chem

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?

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.

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

(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

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

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

Common Ion effect: Calculate solubility

The molar solubility of silver phosphate in a 0.259 M silver nitrate solution is _____ M.

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

04/08/21

Bohr model calculations

Calculate the energy of an electron in the n = 3 level of a hydrogen atom.

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?____???_____

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

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?

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

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

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

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

4. Magnesium is the limiting reactant in this experiment. Calculate the theoretical yield of MgO for each trial

Data Trial 1 Trial 2 Mass of empty crucible with lid 26.687g 26.696g Mass of Mg metal, crucible, and lid 27.105g 27.014g Mass of MgO, crucible, and lid  27.374g 27.218g Mass of Mg for each... more

03/28/21

Use primary standard to determine unknown concentration

Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand... more

When 3.87 g of a nonelectrolyte solute is dissolved in water to make 235 mL of solution at 28 °C, the solution exerts an osmotic pressure of 857 torr.

What is the molar concentration of the solution?How many moles of solute are in the solution?What is the molar mass of the solute?
Chem Chemistry

03/16/21

pH values of solution x

Please help me with this quesions! I feel I have an overall understanding of everything but I am having trouble applying it to these...A student prepares a solution (Solution X) by dissolving 0.045... more

03/13/21

SOS! Please help with rate law problem!

Step 1 : A + B → C + E (slow) Step 2 : B + E → D (fast)Predict the rate law if step 1 is slow.

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