Answer: 0.174 g
Explanation:
First of all understand that charge on an atom like here 2+ will not vary molar mass. because ions are formed by loss or gain of electrons and electrons do not contribute to the mass of an atom or ion. so losing or gaining electron doesnt create any difference.
molar mass of Fe, i.e. mass of 1 mole of Fe is 56 g. So, mass of 1 mole of Fe2+ will also be 56 g.
given is 0.003109 moles of Fe2+,
Use maths,
1 mole of Fe2+ weighs 56 g
So, 0.003109 moles will weigh = (56 g / 1 mol ) x 0.003109 = 0.174 g.
Answer:
3 g/mL
Explanation:
Density is mass divided by volume (g/mL).
Mass of rock = 12.5
Volume of rock = 24-20 = 4mL
Density of rock = 12.5g/ 4mL = 3.125 g/mL
Round to the lowest number of significant figures which is 1 to get 3 g/mL
Answer:a CPU
Explanation:
It is the brain of a computer
The type of recording that is the best and most useful method of submitting evidence to a crime lab is by videography.
The videography is the type of evidence that pretty much contains everything that can be get from a recording because it has both the visual aspects and the audio aspects of the crime scene. It can be said that the videography represents the ultimate type of notes.
So if the compound has the smallest gram formula mass it has the highest percentage composition by mass of strontium