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Chmistry

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chmistry
iron+oxygen

CHMISTRY
HOW DO YOU CALCULAT KC FOR THE REACTION

chmistry
if the %T for a sample is 80 at 50nm, what is the value of A

chmistry
if the %T for a sample is 80 at 50nm, what is the value of A

chmistry
what substance has the density of .60g/ml

Chmistry
what numerical values of l are possible for n=4

Chmistry
calculate the molar mass of the compound (K S 0 4 .1 2 H 2 0 )

chmistry
preparation of Mercury xylocaine in lab

chemistry
hey can u tell that who invented chmistry and is this subj is conceptual or not?

Chmistry
how to calculate ph if given contain 0.63g og hno3 pet 100 ml solution

Chmistry
What is the volume of a cube that has the following measurements (length 20.0 cm, width 152 mm, height 0.458 m)

chmistry
Given that \rm S is the central atom, draw a Lewis structure of \rm OSF_4 in which the formal charges of all atoms are zero.

chmistry
balance each of the following chemical equations ,using the change in oxidation number method. cu +h2so4=cuso4+so2+h2o

IGWE BU IKE SCHOOL, CHMISTRY
what are four method use in separating silver chloride (solid) and sodium trioxonitrate (v) (agueous)

chmistry
the volume of a sample of helium is 4.5ml at 20.0c and 203.0kpa. what will its volume be in the figure?

chmistry
A 4.98 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25 kJ/°C. If the temperature rose from 29.5°C to 69.8°C, determine the value of ΔH°comb for aniline.

chmistry
3O2(g)---> 2O3(g) Delta H = +284.6 kJ what is the sign of delta G and delta S

Chmistry
28.31 mL of O2(g) at 1.00 atm pressure dissolve in 1.00 L of water at 25.0 °C. If the pressure of O2(g) is raised to 3.86 atm what will the new concentration of oxygen be expressed in mol/L

Chmistry
A sample of copper with a mass of 63.5g contains 6.02x10^23atoms.Calculate the mass of a single copper atom.

chmistry
For the following equation, how many grams of NO2 can be formed from 2.50 g of CuO mixed with 0.500 L of NO gas at 25 C and 1.12 atm. ? 2 CuO (s) + NO (g)  Cu2O (s) + NO2 (g

PHYSICAL CHMISTRY
A sample of methane gas of mass 35 g at 250 K and 12.5 atm expands isothermally until its pressure is 1.5 atm. Determine the change in entropy of the gas.

chmistry
You run out of brown sugar and decide to use 1.5 cups granulated sugar instead. The cookies come out much thinner than usual. Formulate a one-sentence hypothesis for why the recipe failed.

chmistry
a aqueous solution of hydrochloric acid has concentration of 37. wt % convert in concentration value to molar concentration if the density of the solution is 1.19g/ml molar mass of Hcl=36.46g/mol t

Chmistry
Any object, be it a space satellite or a molecule, must attain an initial upward velocity of at least 11.2 km/s in order to escape the gravitational attraction of the earth. What would be the kinetic energy in joules of a satellite weighing 2337 lb that has the speed equal to ...

chmistry
gunpowder is a mixture of potassium nitrate , sulfur and carbon in th proportion (by mass) of 6:1:1 (KNO3;S:C). A typical riflr shell contains 3.2 gunpowder. How many moles of each compnent are there in our sample gunpowder? KNO3 mole: C: mol S: mol Thank you for helping!!

chmistry
Compound: Concentration: Measured deltaT LiCl 6.00 g/kg 0.492 deg C HCl 4.00 g/kg 0.389 deg C NaCl 6.00 g/kg 0.356 deg C Determine the value of the vant hoff factor for each salt for the experimentally measured delta T value. (kf=1.86) I have tried to figure this out, but it ...

chmistry
a solutiona solution is made by dissolving 3.75g of a pure nonvolatile solute in 95g of acetone. the boiling point of pure acetone was observed to be 55.95 Centigrade that,and that of the solution was 56.50 Centigrade.if the molar boiling point elevation constant(Kb)of acetone...

Chmistry
pcl3(g) cl2(g) ¨ <--- pcl5(g) Energy Some PCl3 and Cl2 are mixed in a container at 200 degrees celius and the system reaches equilibrium according to the equation above. Which of the following causes and increase in the number of moles of PCl5 present at equilibrium? I. ...

chmistry
When 0.633 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 103C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant figures. Do not ...

Chmistry
For the following reaction, 4.35 grams of hydrogen gas are allowed to react with with 10.3 grams of ethylene (C2H4). hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g) What is the maximum amount of ethane (C2H6) that can be formed? grams What is the FORMULA for the limiting ...

Chmistry
For the following reaction, 4.35 grams of hydrogen gas are allowed to react with with 10.3 grams of ethylene (C2H4). hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g) What is the maximum amount of ethane (C2H6) that can be formed? grams What is the FORMULA for the limiting ...

Chmistry
Write a balanced chemical equation for the combustion of acetylene if the products are: a) Carbon and water vapour b) Carbon monoxide and water vapour c) Carbon, carbon dioxide. Carbon monoxide and water vapour d) The complete combustion of acetylene

Chmistry
Sodium metal dissolves in liquid mercury to form a solution called a sodium amalgam. The densities of Na(s) and Hg(l) are 0.97 g/cm3 and 13.6 g/cm3, respectively. A sodium amalgam is made by dissolving 1.0 cm3 Na(s) in 20.0 cm3 Hg(l). Assume that the final volume of the ...

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