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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...
How many oxygen molecules are present in 113.97 liters of oxygen gas at STP?
i do not know how to work this out please help me
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.
What mass of water is necessary to prepare 280.0 g of 1.20% saline solution?
Please explain. Thanks
how many gumballs in 1 mole can cover the earths surface in one year
please solve and explain
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...
