How many milligrams of calcium are there if you have 1.05 x 1022 atoms

698mg

Explanation:

1 mole of any substance contains 6.02x10^23 atoms as explained by Avogadro's hypothesis. This means that 1mole of Ca also contains 6.02x10^23 atoms.

1mole of Ca = 40g

40g of CO2 contains 6.02x10^23 atoms.

Therefore, Xmol of Ca will contain 1.05 x 1022 atoms i.e

Xmol of Ca = (40 x 1.05 x 1022)/6.02x10^23 = 0.698g

Recall: 1g = 1000mg

0.698g = 0.698 x 1000 = 698mg

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

the answer is c

tell me if wrong