Balloons filled with oxygen will sink and balloons filled with nitrogen will also sink, this is because oxygen is more dense than air but nitrogen is only slightly less dense than air meaning it is not enough for the nitrogen to rise
Answer:
55.4g
Explanation:
Given parameters:
Number of atoms in the bottle = 8.34 x 10²²atoms
Unknown:
Mass of air in the bottle = ?
Solution:
The given specie is argon.
Molecular mass of Argon = 40g/mol
To find the mass of this Argon ;
Mass = number of moles x molecular mass;
Let us find the number of moles of the Argon;
6.02 x 10²³ atoms can be found in 1 mole of any substance
8.34 x 10²² atoms will give 
mole of Argon
= 0.139mole of Argon
So;
Mass of argon = 40g/mol x 0.139mole = 55.4g
Answer: The mole ratio of 
to 
is 1: 1
Explanation:
According to the balanced chemical equation ,the number of atoms of each element has to be same on reactant and product side. The stoichiometric coefficients of the species represent their number of moles.
Thus in the reactants, there is 1 mole of and 1 mole of 
molecule. And thus there is 1 mole of in the product as well.
Thus the mole ratio of to is 1: 1
The correct answers are ,
A) C
B) N
C) Ti
D) Zn
E) Fe
F) Phosphorus
G)Calcium
H) Helium
I) Lead
J) Silver
<h3>How are elements named?</h3>
Elements have been given names based on a variety of factors, <u>including their characteristics</u>, the compound or ore from which they were extracted, the method by which they were found or acquired, mythical characters, locations, and well-known individuals. Some components have <u>names that are descriptive and are based on one of their attributes.</u>
The International Union of Pure and Applied Chemistry chooses the official element names and symbols (IUPAC). However, different nations frequently use similar names and symbols for elements. Official names and symbols for elements are not given until after their discovery has been confirmed. The discoverer may then suggest a name and a symbol.
There are name standards for several element groupings. Names of halogens end in -ine. All noble gas names, save helium, end in -on. The names of most other elements finish with -ium.
To learn more about elements:
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<span>Density is a value for
mass, such as kg, divided by a value for volume, such as m3. Density is a
physical property of a substance that represents the mass of that substance per
unit volume. We calculate as follows:
PV = nRT
PV = mRT/ Molar mass
m/V = P(molar mass)/RT
Density = P(molar mass)/RT
Density = 2.0 ( 30.97 ) / 0.08206 ( 20 + 273.15) = 2.57 g/L <----First option</span>
