Atomic weight of the element
An element crystallizes in a body-centered cubic lattice. The edge of the unit cell is 3.17 A, and the density of the crystal is 6.99 g/cm^3. Calculate the atomic weight of the element.
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The maximum number of electrons in an atom that can have quantum numbers n=2 and l=1 is: a. 2 b. 4 c. 6 d. 8  Which species is diamagnetic in the ground state
Write a balanced equation for the double-replacement precipitation reaction described, using the smallest possible integer coefficients. [silver nitrate and cobalt(II) iodide]
Acetic acid is a weak acid whose Ka is 1.8 X 10^-5. Calculate the predicted pH values for 1.0 M, 0.10 M, and 0.010 M acetic acid.
A certain first-order reaction has a rate constant of 2.75 x 10-2s-1 at 20oC. What is the value of k at 60oC if E = 105 kJ/mol?
A reaction has an equilibrium constant of 8.2 X 10^3 at 298 K. At 764 K , the equilibrium constant is 0.53. Find Delta H rxn for the reaction.
How many orbitals are there in a atom with the following combinations of quantum numbers? A). n=3 l=1 B). n=4 l=2 ml=2
The average osmotic pressure of blood is 12.3 atm at 27 degree C. what concentration of glucose will be isotonic with blood
When two gases are mixed, they follow Dalton's law of partial pressures. -It is impossible to compress a gas enough so that it takes up no volume. -CO2 gas becomes dry ice (solid CO2) at 1 atm and -78.5 °C.
Consider 4.90 L of a gas at 365 mmHg and 20. degrees celisus . If the container is compressed to 3.00 L and the temperature is increased to 40.degrees celisus , what is the new pressure, P2, inside the container
A substance contains 35.0 g nitrogen, 5.05 g hydrogen, and 60.0 g of oxygen. How many grams of hydrogen are there in a 185-g sample of the substance?
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