<span>The
answer is compound. Elements are
composed of one kind of atoms bonded
together. There are different types of compounds: ionic, complexes, molecular,
and intermetallic compounds. The proportion of
elements in the compound is expressed
using a chemical formula. An example of
an element is Aluminium while an example of a compound is H2S (Hydrogen sulfide).</span>
Answer:
Not exactly sure what you mean by this, but "The average density of an object equals its total mass divided by its total volume."
Explanation:
Hope this helps!
Answer:
Explanation:
Let A₀ = the original amount of ⁵⁵Co
.
The amount remaining after one half-life is ½A₀.
After two half-lives, the amount remaining is ½ ×½A₀ = (½)²A₀.
After three half-lives, the amount remaining is ½ ×(½)²A₀ = (½)³A₀.
The general formula for the amount remaining is:
A =A₀(½)ⁿ
where n is the number of half-lives
n = t/t_½
Data:
A = 1.90 ng
t = 45 h
t_½ = 18.0 h
Calculation:
(a) Calculate n
n = 45/18.0 = 2.5
(b) Calculate A
1.90 = A₀ × (½)^2.5
1.90 = A₀ × 0.178
A₀ = 1.90/0.178 = 10.7 ng
The original mass of ⁵⁵Co was .
Answer:
P₂O₄
Explanation:
From the question given above, the following data were obtained:
Empirical formula = PO₂
Molar mass of compound = 126 g/mol
Molecular formula =.?
The molecular formula of the compound can be obtained as illustrated below:
Molecular formula = [Empirical]ₙ
= molar mass
[PO₂] × n = 126
[31 + (16× 2)] × n = 126
[31 + 32] × n = 126
63 × n = 126
Divide both side by 63
n = 126 / 63
n = 2
Molecular formula = [PO₂]ₙ
Molecular formula = [PO₂]₂
Molecular formula = P₂O₄
