戇戇居士

How many liters of SO2 and O2 are required to produce 2250.g sulfur trioxide? Assume the gas volumes are measured at STP2?

For the reaction H2+I2----2HI Kc is 49.?

Calculate the pH of abuffer solution that contains 0.25M HCNO and 0.10M NaCNO. The Ka of HCNO is 2.2 x 10^-4 How is this done?

Can someone help me with these Chemistry Problems? Write equilibrium expressions for the following reactions [...] denotes subscript?

25 mL of acetic acid solution of an unknown concentration was titrated to the equivalence point with 11.25 mL of 0.998 M NaOH.?

ChEMISTRY?

What is the final volume in milliliters when 0.752 L of a 20.5 M solution is diluted to 13.0 M ?

If the Ka of a monoprotic weak acid is 7.2 × 10-6, what is the pH of a 0.22 M solution of this acid?

In the reactions below identify the species being oxidized and reduced.?

How many grams of NH4Cl must be added to 0.100 L of 0.441 M NH3 to produce a buffer solution with pH= 9.38 ? pKa (NH4Cl) = 9.24?

The total concentration of ions in a 0.250 M solution of HCl is __The total concentration of ions in a 0.250 M solution of HCl is __?

Please help with this chemistry problem!?

What is the pH of a neutral solution at a temperature where Kw=9.9×10−14?

Calculate the equilibrium constant, Kc, for the ethanol-acetic acid reaction based on this experiment.?

A handful of lead shot is heated to 80°C and dumped into 250.0g of water at 20.0°C. The mixture comes to thermal equilibrium at 40.0°C.?

Which electron transition in a hydrogen atom requires the largest amount of energy? a) 1-->2 b) 2-->3 c) infinity-->1 d) 3-->5?

I've been stuck on this equation for 2 hours, please help?

Calculate the mass of 6.02*10^21 molecules of nitrogen.?

Geometry question?

Half-life Problem?

what is the equation of a polynomial function whose only roots are 1,-2,and 4, has a odd degree, negative leading coefficient,?

can someone help me with this question please thank you!!?

if a#b=a(squared)+b and a@b=b-a, what is value of ((1#3)@2)?

I need help with math question?!?! Factorise: x^2 -25 + xy - 5y Can you explain why for the steps Thanks, its hard to find step by step?

Find the value of x, x^15 = 32768.. Please help?

What is the pH of a solution measured to be 0.10 M in sodium acetate and 0.20 M in acetic acid? [Ka= 1.8*10^-5]?

Why does ionization energy increase from left to right in a period?

How many moles are in a mass of 5.6g of NaBrO3?

Chemistry help please calculating number of atoms in given grams of atom?

The points A(1,3), B(7,1) & C(-3,-9) form a right angled triangle & lie on the circumference of a circle.What is the equation of the circle?

Can someone explain to me step by step? In the reaction: 2A+3B->C Four moles of A react with four moles B. What reactant is limiting?

Physics Homework?

Chemistry Help!!!?

Algebra help?

what is the trend in polarising power of group 2 cations as we go down the group?

Show that (4x-5)/(2x+1) =2-((7)/(2x+1))?

Show that (4x-5)/(2x+1) =2-((7)/(2x+1))?

CaO + NaOH =?

CaO + NaOH =?

Calculate pH of 0.1M NH4NO3?

Question related to half equation.?

What mass of sodium benzoate should be added to 160.0 mL of a 0.15 M benzoic acid solution in order to obtain a buffer with a pH of 4.25?

Find All Real Solutions?

CHEMISTRY QUESTION, please help.?

please help in this calculus question!!!?

CAN SOMEONE PLEASE HELP ME WITH THIS CHEMISTRY QUESTION PLEASE???!!!?

When 14.05 mL of Hal of unknown concentration (but less than that of the base)?

What am I doing wrong in this intro to chemistry problem?

the boling point of ch4 would be ____ the boiling point of CH3 Ch2 CH3 Lower than , Higher than , Equal to?

choose 4 numbers from 1 to 5 to form a 4-digit number. What is the biggest such 4-digit number divisible by 6?