Determine the number of atoms in each sample: 62.1 g titanium, ti; 9.24 g neon, ne; and 879 g lead, pb

Answers:

Ti: 5.49 × 10²²
Ne: 2.75 × 10²³
Pb: 2.55 × 10²⁴

Explanation:

You need to use the mass formula from the molar mass equation:

1) By definition: atomic mass = mass of 1 mole of atoms

⇒
                         mass in grams
atomic mass =
                         number of moles

Solving for number of moles:

                                   mass in grams
number of moles = 
                                    atomic mass

2) search for the atomics masses of the elements in a periodic table and compute the number of moles. This table shows you how:

element     atomic mass      mass in grams   number of moles
                     (g/mol)                   (given)

Ti                47.687               62.1                    62.1g/47.681g/mol = 0.0912 

Ne              20.180               9.24                    9.21g / 20.18g/mol = 0.456

Pb               207.2                879 g                  879g / 207.2g/mol = 4.24

3) use Avogadro's number to convert number of moles into number of atoms

Formula:
number of atoms = Avogadro's number × number of moles

number of atoms = 6.022 × 10 ²³ atoms/moles × number of moles

Answers:

element         number of atoms                     

Ti                    0.0912 × 6.022 × 10²³ =  5.49 × 10²²

Ne                  0.456 × 6.022 × 10²³ = 2.75 × 10²³

Pb                  4.24 × 6.022 × 10²³ = 2.55 × 10²⁴

Sorry i am 5 years old

Answer:

a. energy is absorbed in the reaction.

explanation:

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.