Answer:
The correct answer is - 18.
Explanation:
The number of hydrogen atoms is indicated by the formula (NH4)2C7H10O2 that has two parts (NH4)2 and C7H10O2 then
Number of hydrogen atoms in (NH4)2 = 4*2= 8
number of H atoms in C7H10O2 = 10
then the total number of atoms = 10+8
= 18.
Thus, the correct answer is = 18 hydrogen atoms.
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Formulas have helped us understand the compound structure and its behavior by letting us know the exact composition of a molecule.
Different atoms have different properties, also, a different arrangement of atoms lead to different geometrical shapes. To understand compound structure and behavior it is necessary to know which atoms are in the molecule and how are they arranged. These two pieces of information can be obtained from the Chemical Formula, which tells us precisely the atoms and the proportions of each one in a given compound.
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Answer:
A) the temperature of the water will increase.
Explanation:
Consider, first, the dissolution of anhydrous calcium chloride, CaCl2 in water. CaCl2 is a very water soluble ionic compound that, in solution, dissociates into the component ions, Ca2 + and Cl-, which interact strongly with water molecules.
The thermochemical equation that represents the process of dissolution of CaCl2 (s) indicates that it is a strongly exothermic process:
CaCl2(s) --> Ca+2(aq) + 2Cl- (aq) ΔH = -82.8 kJ
Therefore, dissolving CaCl2 in water will produce the release of energy in the form of heat (82.8 kJ per mole of dissolved CaCl2)
The smallest and the basic particle of a chemical element is said to be an atom. It is made up of three subatomic particles that is electrons, protons and neutrons. The neutrons and protons are present in the nucleus of an atom whereas electrons are present in the orbits around the nucleus of the atom. There are several shells in the orbital depending on the atomic number. The electrons which are present in the outermost shell are said to be valence electrons.
They can be determined by the electronic configuration of the element.
The atomic number of strontium, 
is 38. The electronic configuration of strontium, is:
From the electronic configuration it is clear that the outermost shell of strontium, is 
. So, the number of valence electrons in strontium, is 2.
Hence, there are 2 valence electrons in an atom of strontium ().
