To determine the number of helium atoms present in a given mass of helium, we first convert the mass into number of moles by dividing the atomic mass of helium which is 4 grams per mole. Then, we multiply the Avogadro's number which <span>represents the number of
units in one mole of any substance. This has the value of 6.022 x 10^23 units /
mole. We do as follows:
537 kg He ( 1000 g / 1 kg ) ( 1 mol / 4 g ) ( 6.022 x 10^23 atom / mol ) = 8.08x10^28 atoms He</span>
solution;
Rhizoferrin is a member of a new class of siderophores (microbial iron transport compounds) based on carboxylate and hydroxy donor groups rather than the commonly encountered hydroxamates and catecholates. We have studied the coordination chemistry of rhizoferrin (Rf), as a representative of this group, with Fe(3+), Rh(3+), Cr(3+), Al(3+), Ga(3+), VO(2+), and Cu(2+). The metal complexes have been studied by UV-vis, CD, NMR, and EPR spectroscopies and mass spectrometry. The formation constants for the iron complex have also been measured and yield a log K(LFe) of 25.3. The Rh and Cr rhizoferrin complexes are unusual in that they appear to adopt a chirality about the metal center that is the opposite of the native iron analog. Several of the alternative metal ion complexes are found to have biological activity toward Morganella morganii in a plate type assay.
Answer: NH3 and NH3
Explanation:
If hydrogen is bonded to a highly electronegative element, a strong dipole-dipole attraction is set up with strength ten times greater than normal dipole-dipole attractions, and it is crystal clear that electronegativity increase from left to right across the period and it decreases down the group. Nitrogen being electronegative more than Oxygen will exhibit a greater dipole-dipole attraction. As such, NH3 and NH3 is the right answer.
the answer depends on the picture or the diagram.
can you send it, please?
The answer is C. atom. An atom is the smallest fraction of a chemical element that can ever exit. An atom consists three particles which are the protons neutrons and electrons. Electrons are found around the center of the atom. The protons and neutrons are found in the center of the atom