戇戇居士

[匿名]

回覆: 1

2017-04-26 7:47 am

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

[匿名]

回覆: 1

2017-04-25 6:05 pm

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

[匿名]

回覆: 2

2017-04-25 1:02 pm

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?

[匿名]

回覆: 2

2017-04-15 2:47 pm

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

[匿名]

回覆: 1

2017-04-12 1:47 am

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.?

[匿名]

回覆: 1

2017-04-05 2:41 pm

ChEMISTRY?

[匿名]

回覆: 1

2017-04-01 10:05 am

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

[匿名]

回覆: 2

2017-03-29 3:19 pm

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?

[匿名]

回覆: 1

2017-03-28 12:50 am

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

[匿名]

回覆: 1

2017-03-27 12:13 pm

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?

[匿名]

回覆: 1

2017-03-24 8:45 pm

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 __?

[匿名]

回覆: 1

2017-03-16 1:09 am

Please help with this chemistry problem!?

[匿名]

回覆: 2

2017-03-15 1:42 am

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

[匿名]

回覆: 2

2017-03-14 2:41 pm

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

[匿名]

回覆: 1

2017-03-10 10:48 pm

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.?

[匿名]

回覆: 2

2017-03-10 7:23 pm

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?

[匿名]

回覆: 2

2017-03-10 1:29 pm

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

[匿名]

回覆: 1

2017-03-08 3:56 pm

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

[匿名]

回覆: 13

2017-02-28 2:40 am

Geometry question?

[匿名]

回覆: 1

2017-02-27 3:04 pm

Half-life Problem?

[匿名]

回覆: 3

2017-02-27 2:49 pm

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

[匿名]

回覆: 1

2017-02-26 10:24 pm

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

[匿名]

回覆: 2

2017-02-24 10:18 pm

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

[匿名]

回覆: 2

2017-02-24 4:48 pm

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?

[匿名]

回覆: 3

2017-02-21 7:25 pm

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

[匿名]

回覆: 1

2017-02-21 3:26 pm

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]?

[匿名]

回覆: 1

2017-02-21 12:58 am

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

[匿名]

回覆: 3

2017-02-20 2:52 pm

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

[匿名]

回覆: 1

2017-02-17 9:53 am

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

[匿名]

回覆: 7

2017-02-16 12:58 am

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?

[匿名]

回覆: 1

2017-02-15 2:05 pm

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?

[匿名]

回覆: 1

2017-02-14 11:29 pm

Physics Homework?

[匿名]

回覆: 1

2017-02-12 1:49 pm

Chemistry Help!!!?

[匿名]

回覆: 3

2017-02-12 10:56 am

Algebra help?

[匿名]

回覆: 1

2017-02-10 4:22 pm

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

[匿名]

回覆: 2

2017-02-10 1:34 pm

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

[匿名]

回覆: 1

2017-02-10 1:34 pm

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

[匿名]

回覆: 3

2017-02-10 1:13 pm

CaO + NaOH =?

[匿名]

回覆: 3

2017-02-10 1:14 pm

CaO + NaOH =?

[匿名]

回覆: 3

2017-02-10 12:47 am

Calculate pH of 0.1M NH4NO3?

[匿名]

回覆: 1

2017-02-08 3:13 pm

Question related to half equation.?

[匿名]

回覆: 1

2017-02-08 11:25 am

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?

[匿名]

回覆: 2

2017-02-07 3:44 pm

Find All Real Solutions?

[匿名]

回覆: 1

2017-02-07 1:52 pm

CHEMISTRY QUESTION, please help.?

[匿名]

回覆: 1

2017-02-03 3:56 pm

please help in this calculus question!!!?

[匿名]

回覆: 2

2017-02-01 11:58 pm

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

[匿名]

回覆: 2

2017-01-31 11:39 pm

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

[匿名]

回覆: 1

2017-01-31 12:27 pm

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

[匿名]

回覆: 1

2017-01-31 12:09 am

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

[匿名]

回覆: 6

2017-01-31 12:01 am

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