Answer:
A
Explanation:
2.60 g of CoCl2 was dissolved in water to make 100 mL of solution.
Number of moles of CoCl2 dissolved = mass/molar mass
= 2.60/130
= 0.02 mole
Molar concentration of solutions = number of moles/volume (dm3)
= 0.02/0.1
= 0.200 M
Hence, the molar concentration of thesolution is 0.200 molar.
Correct option = A
Pretty sure it is 24/12 Mg and 25/12 Mg sorry if im wrong
The instrument is a Geiger counter and is used to measure radioactive level around people's bodies.
Answer:
there all made of atoms
Explanation:
you did not specify which types of matter
Smaller atoms and stronger bonds promotes greater hardness in minerals.