How many moles of oxygen are present in 3.53 grams of carbon dioxide? The earth has a mass of 5.98 \times 10^{24} kg. The average mass of the atoms that make up the earth is about 39 u. Based on this average mass, how many atoms are in the earth?
How many valence electrons does the element N have? Give the electron configuration for 2He. How many valence electrons does it have? How many valence electrons does Ne have? How many valence electrons are in each of the following elements? O, S, Br, Rb ...
How many atoms of chlorine are in 25.3 g of C2Cl6? A certain molecule contains twice as many atoms of hydrogen as oxygen and one more atom of carbon than hydrogen. If there are 21 atoms altogether in the molecule, how many atoms of carbon are there? How many tr...
To this end, they define a mole of any element or compounds as Avogadro's number (6.022 × 1023) of atoms or molecules. The mass of this many particles, measured in grams, is the same number as the molecular mass, measured in atomic mass units. The definition of a mole is thus the...
How many lone pairs of electrons are on the central I atom of the ICl2- ion? How many electrons are there in the covalent bonds surrounding the central atom in the following following species? Draw the Lewis structure for each. a. (CH_3) Al_3 b. B_2 Cl_4 c. Se...
How many moles are in 4.39 grams of LiCl?Molar Mass:A mole of a substance is defined as that many chemical units of that substance as there are atoms in a pure, 12 grams sample of carbon-12. This constant number is called Avogadro's constant, and the mass contained by a mole of a...
Several elements in the periodic table will exist in the standard state as a gaseous collection of diatomic molecules, rather than single isolated atoms. If a sample of the element contains Avogadro's number of these diatomic molecules, then the corresponding mass in grams will be twice the ...
How many single bonds are in the Lewis structure for CH4? Lewis Structure: An atom forms a single covalent bond with another atom through the atoms sharing one valence electron pair. If the starting atom originally contains several valence electrons, then it can form multiple covalent bonds ...
Molecules are small particles of a substance made from two or more atoms. If the atoms come from different elements, the molecule will be called a compound. Molecules can have as few as two atoms or hundreds of atoms.Answer and Explanation: ...
How many valence electrons must be accounted for in the Lewis structure of chloroethane (C2H5Cl)? What is the total number of valence electrons in the Lewis structure of AsO2-? Determine the number of valence electrons in an atom of each element. (a) Ba (b...