Answer:
Neutrons play no role in the net charge of an atom, so you can ignore them here.
Proton = 7
Electron = 10
Net Charge = 7 - 10
= -3
Again,
Proton = 3
Electron = 2
Net Charge = 3 - 2
= 1
The molar mass of BF3 is 67.81 g/mol
<em><u> Explanation</u></em>
- Molar mass is the mass of all atoms in a molecule in gram per mole.
- molar mass of a molecule is calculated by adding atomic mass of constituent atom
- use the periodic table to determine the atomic mass of each element in the molecule.
that is;
atomic mass of B = 10.81 g/mol
atomic mass of F = 19 g/mol
- since there 3 atoms of F in BF3 the atomic massof F in BF3= 3 x19 = 57 g/mol
- total molar mass of BF3 = 10.81 g/mol + 57 g/mol = 67.81 g/mol
Coefficients in a chemical equation express RATIOS between molecules or compounds.
In chemical equations, coefficient refers to those numerical numbers that are usually written at the front of elements' chemical symbols in order to balance the equations. Coefficients tell us the number of a particular element that must react with a specific number of another element in order for certain amount of chemical products to be produced; that is, it provide information about the reaction ratio of reactants and products. For instance, look at this chemical equation: N2 + 3H2 = 2NH3
In the equation given above, the coefficient of N2 is 1, the coefficient of H2 is 3 and the coefficient of NH3 is 2. What this equation is essentially telling us is that, in order to produce two molecules of ammonia, one molecule of nitrogen must react with three molecules of hydrogen. Thus, the equation gives the ratios between the product and the reactants.
It works closely with the digestive system in order to absorb + distribute nutrients throughout the body
It also works with circulatory system which carries the chemical signals from the endocrine system (endocrine system is the one that controls the speed of digestion)
