Answer:
To find out the number of atoms: MULTIPLY all the SUBSCRIPTS in the molecule by the COEFFICIENT
Explanation:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
n(O₂)=1.407 mol
M(C₃H₈)=44.1 g/mol
m(C₃H₈)/M(C₃H₈)=n(O₂)/5
m(C₃H₈)=M(C₃H₈)n(O₂)/5
m(C₃H₈)=44.1*1.407/5=12.410 g
the mass of propane is 12.410 g
Properties of metals:
High melting points
High density
Ductile
Malleable
Good conductors of electricity
Good conductors of heat
I think if you added a proton you would have chlorine.
The noble gasses are the he chemical elements in group 18 of the periodic table. The gasses in this family include helium, neon, argon, krypton, xenon, and radon. All these gasses are colorless are oderless, elements in this family have atoms with a full outer shell of electrons. They are also called inert gasses.
Six valence electrons
The majority of metals are found in ores.
But a few such as copper, gold, platinum, and silver frequently occur in the free state because they do not readily react with other elements.