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# what elements is represented by each electron cofiguration

{ar} 4s2   {kr} 5s2 4d 10 5p4

# calculating the van't Hoff factor

When 9.12 g of HCl was dissolved in 190 g of water, the freezing point of the solution was -4.65oC.  What is the value of the van't Hoff factor for HCl? Here is what I did- I know that I use:...

# An unknown element X can form a compound with the formula XF3. In which group on the periodic table would element X can be found?

1.) Group 1 2.) Group 2 3.) Group 13 4.) Group 14 This question doesn't make any sense to me :/ Can you please explain it?

# Which compound has the least ionic character?

1.) KI 2.)HCl 3.) MgS 4.) NO

# What combination of number of bonds and number of unshared pairs of electrons will result in a bent shape?

1. 4 and 0 2. 3 and 1 3. 3 and 0 4. 2 and 2

# how many electrons does aluminum have?

i need ti know how many electrons aluminum have

# Hi, I'm stuck with the following chem problem:So I can't paste it but will describe.

I have (3S,4S)-3-bromo-3,4-dimethylhexane but I don't know based on on the given picture why that is. I cannot post the picture but here the description. I start out with two carbons, then use...

# At 1 atm, how much energy is required to heat 83.0 g of H2O(s) at –12.0 °C to H2O(g) at 115.0 °C?

At 1 atm, how much energy is required to heat 83.0 g of H2O(s) at –12.0 °C to H2O(g) at 115.0 °C?

# whats the Lewis structure for HOCl?

its the molecule HOCl

# Can someone please check my work and answers on these two titration problems?

1.)  If 16.45 mL of 0.135 M nitric acid neutralizes 26.0 mL of ammonium hydroxide, what is the molarity of the base? HNO3(aq) + NH4OH(aq) --> NH4NO3(aq) + H2O(l) I used stoichiometry to find...

# calculate the molecular weight of CO in g/mol.

what is the asnwer?

# gas stoichiometry question

A foul smelling gas produced by the reaction of HCL and Na2S: 2HCl + Na2S --> 2NaCl + H2S is collected in and a 1.00 L sample was found.  How many moles were found in the sample knowing the...

# What is the value of deltaE in kilojoules if the reaction is carried out at a constant pressure of 28.0 atom and the volume change is -2.35 L?

The reaction between bleach and ammonia to yield chlorine gas has a deltaH= -422 kJ What is the value of deltaE in kilojoules if the reaction is carried out at a constant pressure of 28.0 atom...

# Which of the following is NOT a unit factor related to a 5.00% aqueous solution of lithium chloride?

1. 5.00 g LiCl/ 95.0 g water 2. 100 g solution/ 5.00 g LiCl 3. 5.00 g LiCl/ 95.0 g solution 4. 95.0 g water/ 5.00 g LiCl 5. 95.0 g water/ 100 g solution I have no idea, please...

# If 10.0 ml of blood plasma has a mass of 10.279 g and contains 0.870 g of protein, what is the mass/ mass percent concentration of the sample?

Please explain how to do this!  Thanks.

# How does these chemical equation balance, step by step? Why do they balance this way?

I already know how they balnace I just don't understand how they balance. why does the O(2*) balance to 25? 2 C(8*)H(18*) + 25 0(2) yields 16 CO(2*) + 18 H(2*)O These ones have me stumped...

# Will Co(OH)2 solid dissolve in NH3?

My Chemistry Professor said that cobalt (II) hydroxide solid will not dissolve in ammonia, but during the experiment I observed that there was a reaction taking place (the clear ammonia solution turned...

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