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what will be the concentration if 0.7 g NaCl is poured in 0.3 liter destilled water?
an element A has following isotopic composition; 56A : 60%; 58A : 30%; 59A : 10% then average atomic mass of element A will be
A piston cylinder system contains a liquid at 25°C with molar volume given by
V = 20.05 – 6.15 X 10-5 P + 3.7 X 10-8 P
2
- 4 X 10-9 P
3
,
where V is in cm3
/mol and P is in atm for Pressure between 0 and 1000 atm and
(
∂V
∂T)
p
= 0. 007 + 2. 1 × 10−5P (
Cm3
mol . K)
The one mole of liquid is compress at constant temperature of 25°C from 2 atm to 900
atm. Determine the work necessary (J/mol) to carry out this process and the change in its
internal energy.
A combustion process of a 100 mol of solid mineral with 325 mole of pure oxygen is
producing ferric oxide and sulfur trioxide gases. The solid mineral contains of 82 mole% iron
pyrites (FeS2) and 18 mole% inerts.
a) Write the chemical equation for the combustion process.
b) Calculate;
i.
The limiting reactant.
ii.
The percentage of excess.
iii.
The extent of reaction, ξ if complete reaction occurred
A silicon sample is doped with Nd = 1017cm–3 of As atoms.
a) What are the electron and hole concentrations and the Fermi level position (relative to Ec or
Ev) at 300 K? (Assume full ionization of impurities.)
b) Check the full ionization assumption using the calculated Fermi level, (i.e., find the probability
of donor states being occupied by electrons and therefore not ionized.) Assume that the
donor level lies 50 meV below the conduction band, (i.e., Ec – ED = 50 meV.)
Given the following reaction: 5 Br - (aq) + BrO3 - (aq) + 6 H + (aq) →Br2 (aq) + 3 H2O(l) If the concentration of bromide ions decreases by 4.65 mol/L in 0.5 minutes, what is the average rate of reaction?
In binary solvent system...... component of sample fail to separate.
1.light weight 2.heavy 3.polar 4. 1 and 2
The highest the quality of purity of solvent the development of spot will be....?
1.dark 2.light 3.transparent 4.better
How many grams are in each of the following?
15.094 moles of chlorine gas
You need 0.56 mol of electrons to deposit a thin covering of silver on a part that you are using for a prototype machine. How long would you need to run a current of 5.0 A to obtain this number of moles?
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#340153 on Dec 2023