Total mass, in grams, of all the particles in one mole of the substance
Explanation:
- Molar mass is defined as the ratio of the given mass of the substance to the amount of the given substance in moles.
The formula is, Molar mass =
- By definition, these are mass in grams of all the particles in one mole of the substance. The unit of molar mass is g/ mol
- The molar mass of the element is what we see in the periodic table. The periodic table is constructed according to the atomic number of each elements and there represented the atomic mass, which is the molar mass of the elements.
Mass number = protons + neutrons
protons = electrons
so 35 electrons = 35 protons
So 35 protons + 45 neutrons =
80
The element is Bromine with the symbol: Br
Answer:
3.2 x 10²¹molecules
Explanation:
Given parameters:
Volume of nitrogen gas = 120cm³
Unknown:
Mass of nitrogen gas = ?
Number of molecules = ?
Solution:
To solve this problem, note that;
1 mole of gas occupies a volume of 22.4L at STP
Now;
convert 120cm³ to L ;
1000cm³ = 1L
120cm³ gives 0.12L
Since;
22.4L of gas has 1 mole at STP
0.12L of gas will have 
= 0.0054mole at STP
So;
Mass of N₂ = number of moles x molar mass
Molar mass of N₂ = 2(14) = 28g/mol
Mass of N₂ = 0.0054 x 28 = 0.15g
Now;
1 mole of a gas will have 6.02 x 10²³ molecules
0.0054 mole of N₂ will contain 0.0054 x 6.02 x 10²³ =
3.2 x 10²¹molecules
Answer:
a mixture in which the composition is uniform throughout the mixture.
Explanation:
Answer:
Repetition
Explanation:
The best term to describe this example is repetition and not replication.
Most times, to obtain an accurate and precise reading which is reliable, scientist makes several repeated measurements. The average gives the most reliable representation of the phenomenon being tested.
This process is called repetition.
On the other hand, duplicating an experiment is replication. Experiments are replicated to proof their validity.
- Since this is a brand new experiment where 16 height measurements are reported, we are dealing with a repetition situation.
