Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 21

**math**

4x+12=10 x=?

**Chem**

Solubility of Silver(I) Carbonate is 3.2x10^-2 g/100mL What is the Ksp? I'm getting 2.19x10^-12 But it's not in the answer sheet

**Chemistry**

The enthalpy of vaporization of chloroform (CHCl3) is 29.2 kJ mol-1 at its normal boiling point 61.2 Celsius. what is the standard change in entropy for vaporization of chloroform at its normal boiling point? Answer I got was 29.2/334.2 = 0.0873. (CORRECT?)

**Chemistry**

A little lost but I'm getting 384...

**Chemistry **

At the normal boiling point of toluene,Δ Hvap=33.2 kJ/mol and ΔSvap= 86.5J/mol•K. What is the normal boiling point of toluene?

**Chemistry**

What molar ratio of acetic acid to sodium acetate is required to create a buffer solution having a pH of 4.83 at 25 Celsius? Ka for HC2H3O2 is 1.8 x10^-5 a)0.82 b)0.55 c)3.5 d)1.2 e)2.0 The answer I got was 8.2 ..(help!)

**Chemistry**

Nvm got it ..thanks

**Chemistry**

Does it matter which Ka I use?

**Chemistry**

What is the hydronium ion concentration of a buffer solution that is 0.10M NaHPO4 and 0.50M NaH2PO4? For H3PO4,Ka1=6.9x10^-3, Ka2=6.2x10^-8, Ka3=4.8x10^-13

**Chemistry**

What is the hydrogen-ion concentration of a solution that is 0.016M in acetic acid and 0.016M in sodium acetate at 25 Celsius? The Ka for acetic acid is 1.8x10^-5

**Chemistry 104**

What you mean redo 0.018?

**Chemistry 104**

A 0.30M solution of a weak monoprotic acid is 0.41% ionized. what is the acid-ionization constant, Ka for this acid? Use. HA + H2O <==> H3O + A to figure out X for H3O and A

**Physics**

In a circus performance, a monkey on a sled is given an initial speed of 3.2 m/s up a 31° incline. The combined mass of the monkey and the sled is 20.7 kg, and the coefficient of kinetic friction between the sled and the incline is 0.20. How far up the incline does the sle...

**Math**

Answer:$1,528.02 $26,965/12(months)= $2,247.08 12%+17%+3% = 32% 2,247.08 * .32 = 719.06 2747.08 - 719.06 = 1528.06

**chemistry**

suppose you had a sample of water and you knew that either the silver ion or the barium ion were in the water . What negative ion could you add to this water sample that would precipitate out one of the ions but not the other?state which ion would form the precipitate and writ...

**Physics**

3 joules

**algebra/elimation method**

use the elimation method to solve the system of equations. a+8b=11

**8th grade math**

An airplane flies from New Orleans to Atlanta at a rate of 320mph. The airplane then returns at a rate of 280mph. The total travel time is 3 hours. What is the flying time from New Orleans to Atlanta?

**8th grade math**

An airplane flies from New Orleans to Atlanta at a rate of 320mph. The airplane then returns at a rate of 280mph. The total travel time is 3 hours. What is the flying time from New Orleans to Atlanta?

**maths**

3.33333

**Mathematics**

I have a simple question but am having a hard time understanding the explanation of an unreasonable answer. Any help would be helpful. The question is, an auditorium holds 137 students but is only 60% full. How many students are in the auditorium? The answer is 82.2 obviously ...

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