Chemistry - March 2007

What is the molarity of a sodium chloride solution made by dissolving 263.7g to make 2.0L?




What mass CaBr2 is needed to make 500.0mL of 0.554M solution?

2007-03-07 12:52:55 · 2 answers · asked by moody 1

how many grams of KI are needed to prepare 100. mL of 0.55M solution?

2007-03-07 12:50:27 · 1 answers · asked by moody 1

How many grams of table salt would have to dissolved in 135.0 g of water to lower the freezing point by 1.70 degrees celsius?


kf = 1.86 K-kg/mol for water


im lost, any explanation on this?

2007-03-07 12:32:17 · 1 answers · asked by Jessica 1

sugar water:
lithium nitrate:
lead (II) chlorate:
ammonium phosphate:

2007-03-07 12:22:54 · 2 answers · asked by Maria18 2

If 1.00 mol of CS2 is combined with 1.00 mol of )2,identify the limiting reactant
-How many moles of excess reactant remain?and How many moles of each product are formed???



Can someone help?? please??

2007-03-07 12:15:49 · 4 answers · asked by Elegance 1

ok . so we have water in atube then we added Mno subsript 2 . then we closed the tube and then we had a thin stick we light it on . then we turn of and quickly emerssed in the the tube and then it lightes up again . ok i know that Mno is a ctalyst but how come their was more oxygen inside

2007-03-07 12:11:55 · 1 answers · asked by what ever ? 2

M=molar
Molarity= number of moles/ liters of solution

2007-03-07 12:07:36 · 1 answers · asked by Anonymous

How many grams of sulfur (S8) would have to be dissolved in 125.0 g of carbon tetrachloride to lower the freezing point by 2.10 degrees celsius?

kf = 29.8 K-kg/mol for CCl4

2007-03-07 12:07:16 · 1 answers · asked by stargazer 2

in a first order reaction, how many times greater is the time required for 99.9% of the reactant to be consumed than the time required to consume 50% of the same reactant?

2007-03-07 12:07:08 · 1 answers · asked by candy 3

Plz help! its 4 a science project thats due tmw!!!
*PANICPANICPANIC!!!*

2007-03-07 12:06:43 · 2 answers · asked by Anonymous

2007-03-07 12:03:21 · 4 answers · asked by Anonymous

What elements and how many atoms of each does a molecule of CH4 contain.
Molar mass is H 1.01 , C 12.01, Cl 35.45

2007-03-07 12:02:17 · 5 answers · asked by Anonymous

please

2007-03-07 12:01:12 · 1 answers · asked by †ღChristian♥Girlღ† 2

What are the names of these compounds and what are thier charges??

UF6
H2SO4
CLO3
KMnO4

2007-03-07 12:01:05 · 1 answers · asked by Elegance 1

2007-03-07 11:52:30 · 2 answers · asked by Milexis 1

i'm confused can't find the answer in my book

2007-03-07 11:51:58 · 4 answers · asked by Anonymous

Acids& bases
1) HCl(aq)--> Cl-+ H30+
2) HCl+NaOH-->NaCl+2h20

2007-03-07 11:50:57 · 1 answers · asked by Gideon 1

Calculate the boiling points and freezing points of each of the following: 3m sugar water, 3m lithium nitrate (aq), 3m lead (II) chlorate (aq), and 3m ammonium phosphate (aq).

2007-03-07 11:40:52 · 1 answers · asked by Maria18 2

I want to know if chemical reactions result in a new compound being formed, or is it just a solution?

2007-03-07 11:40:26 · 3 answers · asked by sarah13star 2

what is the molar mass of iron, Fe? How many moles of iron atoms are in 111.8 grams of iron?

2007-03-07 11:38:30 · 3 answers · asked by Anonymous

explain please :)

2007-03-07 11:37:30 · 1 answers · asked by SaxiPHNgurl3 2

Silver reacts with nitric acid, HNO3, to form nitrogen monoxide, NO, silver nitrate, AgNO3, and water. To find the answers of the following problems, how should they be set up?:

How many grams of nitric acid are required to react with 5.00 g of silver?

How many grams of silver nitrate will be formed?

How many moles of nitrogen monoxide will be produced?

2007-03-07 11:32:53 · 1 answers · asked by !!! 3

and describe please

2007-03-07 11:29:43 · 4 answers · asked by SaxiPHNgurl3 2

2007-03-07 11:29:10 · 1 answers · asked by jh0ney 1

2007-03-07 11:19:51 · 6 answers · asked by Johnny KAo 2

2007-03-07 11:08:28 · 2 answers · asked by stardust6547 2

what happens when Ca in solid form reacts with Cd(NO3)2 in aq form? What are the products?

2007-03-07 11:08:07 · 1 answers · asked by Amanda C 2

I need to know for my science project.

2007-03-07 10:52:35 · 7 answers · asked by Anonymous

2007-03-07 10:49:16 · 1 answers · asked by charletw2623 2

its a galvanic cell, with 2 half reactions... ihave to draw the cell blah blah but i first have to reverse 1 reaction in order to make it positive and spontaneous.
but im really confused, since reducation takes place at the cathode, and oxidation happens at the anode

which half reaction do i reverse?
Mn^+2 + 2e- --> Mn E*= -1.18V
Fe^+3 + 3e- -->Fe E*= -0.036

Ecell = Ecathode- E anode

im stuck!!!

2007-03-07 10:35:25 · 1 answers · asked by Anonymous