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Chemistry help?

How much energy is evolved when 2.75 mg of Cl (g) atoms adds electrons to give Cl- (g) ions? Electron affinity (Cl) = -349kJ/mol?

Making CO from CO2 is a potential energy source. The value of Kp for the reaction is is 1.50 at 700.0°C. CO2​(g)+C(s)=2CO(g)?

Indicate concentration of each ion present in solution formed by mixing the following. 3.50 g of NaCl in 44.2 mL of 0.238 M CaCl2 solution?

The solubility of PbCrO4 in water at 25°C is measured to be ×1.710−4gL . Use this information to calculate Ksp for PbCrO4 .?

Arrange the following atoms or ions in order of decreasing ionization energy: Sr2+, Se2-, Rb+, Br-?

CH3(C=O)CH3(g) + 4 O2(g) → 3 CO2(g) + 3 H2O(g) I need help determine the approximate enthalpy (in kj) please help?

Chem Question?

A 100 g sample of each of the following metals is heated from 35°C to 45°C. Which metal absorbs the lowest amount of heat energy?

Calculate volume (liters) of 1.572 M KOH that must be added to a 0.112 L solution of 9.80 g of (H3Glu Cl–, MW = 183.59 g/mol) for pH 10.35?

Chem question?

How many moles of CO2 gas are produced?

3.00×10−3 mol of HBr are dissolved in water to make 16.0 L of solution.What is the concentration of hydroxide ions, [OH−] in this solution?

3.00×10−3 mol of HBr are dissolved in water to make 16.0 L of solution.What is the concentration of hydroxide ions, [OH−] in this solution?

3.00×10−3 mol of HBr are dissolved in water to make 16.0 L of solution.What is the concentration of hydroxide ions, [OH−] in this solution?

3.00×10−3 mol of HBr are dissolved in water to make 16.0 L of solution.What is the concentration of hydroxide ions, [OH−] in this solution?

HClO is a weak acid (Ka = 4.0 × 10–8) and the salt NaClO acts as a weak base. What is the pH of a solution with 0.024 M in NaClO at 25 °C?

How do I factor x^3-9x-440=0?

Name all of the alkene isomers, C6H12, that contain an unbranched chain and that have E/Z isomers.?

Draw the structure(s) of all of the alkene isomers, C6H12, that contain an unbranched chain and that have E/Z isomers.?

What mass of oxygen is needed for the complete combustion of 4.00×10−3 g of methane?

A sample of oxygen has a pressure of 500. kPa at 40.0∘C. What will be the temperature in Kelvin at a pressure of 630. kPa?

I need help understand this chemistry problem!?

50.00 mL of 0.0200 M MES (Ka = 5.37x 10^-7) is titrated with 0.1000 M NaOH. Determine which indicator is most appropriate for this titration?

Calc. the pressure of dry O2 if the total pressure of O2 generated over water is measured to be 638 torr and the temp. 22C PH2O=19.8 torr?

CHEMISTRY question please help! Just need you to check my answer. THANKS?

How many moles of Sodium are there in 110 grams of NaHCO3?

Reaction between potassium iodide. and barium hydroxide?

calculate the concentration of a OH- for an aqueous solution with a PH 9.60?

Chemistry question, please help?

In what way will the calculated molar mass be affected if the precipitate is not heated to constant mass. **Please help 5 stars Chemistry***?

Organic chemistry question help?

The point A(-6,1) is reflected over the point (-5, 3) and it's image is point B. What are the coordinates of point B?

What is the bond order of CCl4?

What is the empirical formula of the compound?

Chemistry question?

How much sulfur dioxide would you need to completely react with 6.00 g O2 such that all reactants could be consumed?

Broasted-Lowry acid, help finding result?

A piece of sodium metal undergoes complete reaction with water as follows: 2 Na(s) + 2 H2O(l) → 2 NaOH(aq) + H2(g)?

0.5 mL of toluene react with 1.0 mL of 1 M solution of bromine in CH2Cl2. Calculate the number of mols of each reagent (bromine and toluene)?

Chemistry Question?

If 20.0 mL Ca(OH)2 with an unknown concentration is neutralized by 37.5 mL of 0.124 M HCl, what is the concentration of Ca(OH)2 solution?

Which has the more exothermic electron affinity, the oxygen atom or O-? Explain why.?

Making X the Subject question on photo.?

Aln (x) +b ln (y) =......................?

Write molecular, complete ionic, and net ionic equations for each of the following precipitation reactions.?

When heated KlCO₃ decomposes into KCl and O₂. 2KClO₃-->2KCl+3O₂ If this reaction produced 81.5 grams of KCl, how much O₂ was produced?

What is the oxidation number for S in Na2S4O6 ?

Draw the structure of the geometric isomer of 2-pentene that has the lower melting point. Thank you !?

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