The student originally has 252 grams of water in this experiment.
LAW OF CONSERVATION OF MASS:
- The law of conservation of mass explains that matter (mass) can neither be created nor destroyed but can be changed from one form to another.
- This means that in a chemical reaction, the sum of the masses of the reactants must equate to the total mass of product(s).
- According to this question, a student conducts an experiment to separate water into hydrogen and oxygen. The student collects 28.0 g of hydrogen and 224.0 g of oxygen.
- Since hydrogen and oxygen are the constituent elements of water, the sum of their masses must equate the mass of water.
- Therefore, 224g of oxygen + 28g of hydrogen = 252g of water.
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A mole of sodium chloride has mass 58.44 grams. You get that from adding the molar masses of sodium and chlorine, which are listed on the periodic table.
<span>58.44 g/mol * 4.40 mol = 257.1 or ≈ 257 grams with 3 significant figures</span>
Answer:
π = MRT
= × RT
= ×RT
MM = mxRxT / πxL
MM = 8.00g ×0.0821×298/ 2.86×0.200L
= 342.2 g/mol
Explanation:
the molecular weight of the sugar can be determined by using the osmotic pressure formula.the formula has to be worked on in order to get the molar mass of the sugar.the name of the sugar is called sucrose.
Answer:
A family of proteins known as cupredoxins contain a single redoxactive Cu ion coordinated by a Cys, a Met, and two His residues.
The reduction potentials of cupredoxins range from about 0.15 V to 0.68 V. This information reveals that the role of the protein component of the cupredoxins surpasses the maximum and minimun reduction potentials limits reported for any mononuclear cupredoxin, preserving the metal binding site furter than the typical values for the cupredoxin protein family.
Explanation:
These redox-active copper proteins´ structure and properties of native cupredoxins, and those modified by site-directed mutagenesis, although their wide range of E°, may have evolved to specifically bind copper, developed recognition sites for specific redox partners, tuned redox potential for a particular function, and allowed for efficient electron shuttle. The overall and active site structures are very similar in all T1 cupredoxins, 9 which contain a Cu ion coordinated by a Cys and two His residues in a trigonal planar geometry, and a weak axial ligand, such as Met121 in Az. This is basic to understand the roles of metals from energy metabolism, respiration, cell signaling, and photosynthesis, to catalysis in industrial and fuel cell research, as redox potentials are fine-tuned over a range with little change to the redox-active site or ET properties through a single redox active center, whose reduction potential (E°) must be tunable to match that of a given redox partner without compromising the structural and ET properties of the protein. A number of studies have shown that there is still a deep lack of knowledge about other long-range, non-covalent interactions responsible for tuning E°.