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In the reaction Mg(OH)²+2HCl--->MgCl²+2H²0 you were given 15 grams of Mg(OH)² and 25 grams of HCl.Which of the two reactants is the limiting reagents? How much MgCl² will be produced in the reaction?
The human hemoglobin is a tetrameric protein of about 64.5 KDa, consisting of two a chains and two B-chains tightly bound.
a) Calculate the number of amino acids present in the a-chains
b) What is the length of each B-chain?
e) What is the sum of the length of the two a-chains?
d) Find the length of the tetrameric protein hemoglobin assuming its all an alpha helical structure.
What is the bond order of be2 -?Berrium molecule two two atoms gained one electron
C4H6O3+H2O C2H4O2
Quantitative analysis student Kenny Duit analyzed an ore sample for its copper content and obtained a mean of 4.67% Cu for three measurements. How many additional measurements must Kenny make to obtain a mean that is five times more reliable?
Indicate which of the following are determinate and which are indeterminate errors.
(a) A hygroscopic sample is not dried in the oven prior to weighing.
(b) A buret reading of 28.43 ml. is written down as 28.34 ml..
(c) The bottom of the meniscus in a buret is estimated to be at the zero-milliliter mark but
in fact is very slightly below this mark.
(d) The liquid in a 10-ml. TD (to deliver) pipet is blown out by mouth.
(e) The rest point of a meter needle, oscillating due to some desktop vibration, is estimated incorrectly.
The following pH data were collected in the analysis of water from an upstate New York lake as part of an acid rain study: 4.17, 4.20, 4.19, 4.23, 4.22, 4.14, 4.20, and 4.15. Calculate the following.
(a) mean
(b) median
(c) percent average deviation
(d) percent standard deviation
What is the implied absolute and relative uncertainty in each of the following experimental values?
(a) 16
(b) 2.037
(c) 1.00 * 10 ^ - 3
(d) 0.060714
describe how chlorine gas is produced in electrolysis
II. Describe the spontaneity and entropy of the processes.
1. Formation of CO2 and H2O through the reaction below.
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l)
2. Sublimation of naphthalene balls as represented by this equation:
C10H8(s) → C10H8(g)
3. Formation of H2O from H2 and O2 2H2(g) + O2(g) → 2H2O(l)
