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calculate the internal energy of enthalpy of any random system.also find out the mathematical relation between internal energy enthalpy and then entropy?
of air is bubbled through a solution containing an excess of Ba(OH)2, precipitating
BaCO3. The excess Ba(OH)2 is back titrated with HCl. In a typical analysis a 3.5-L
sample of air was bubbled through 50.00 mL of 0.0200 M Ba(OH)2. Back titrating with
0.0316 M HCl required 38.58 mL to reach the end point. Determine the ppm CO2 in the
sample of air given that the density of CO2 at the temperature of the sample is 1.98 g/L.�
A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it?
The relative atomic mass of bromine which consists of Br 79 35 and Br 85 35 isotopes is 79.9 amu.
Calculate the percent abundance of Br 79 35 and Br 85 35 in the mixture of isotopes?
In an analytical test, a chemist used spectrometer to study the isotopes of an element X. A series of mass of the isotopes was recorded.
24 12X (73.5 %), 25 12X (10.1 %), 26 12X (16.4 %)
In a mass spectrum, show the isotopes peaks of element X?
Submitted Date:- Tuesday, Aug 03
#1. A bacteriophage has A-form DNA. A deletion mutant has a length of 10.4 μm instead of 15 μm. How many base pairs are missing from this mutant?
#2. The base sequence of one of the strands of a 20-bp duplex DNA is 5'-TCCGTTCGACGGTACATC-3' write the base sequence of its complementary strand.
A gas occupies a volume of 175.7 L at 64.3 kPa. What volume will the gas occupy at 98.1 kPa?
1.50 g of aluminium reacted with 35.0 cm3 of 1.00 mol dm–3 copper(II) chloride solution, producing 1.98 g of solid copper. Calculate the percentage yield for this reaction.
2Al (s) + 3CuCl2 (aq) → 2AlCl3 (aq) + 3Cu (s)
HNO3 - N
KOH - O
CO2 - O
MgO - Mg
Use the calculation to determine
1) The period and group of each of the elements
2) state the valency of the calculated element
