How many moles are in 4.8 × 1025 atoms of tungsten?

Answer : The moles of tungsten are, 79.707 moles

Explanation : Given,

Number of atoms of tungsten =

As we know that,

1 mole of substance contains number of atoms.

or we can say that,

As, atom of tungsten present in 1 mole of tungsten

So, atom of tungsten present in mole of tungsten

Therefore, the moles of tungsten are, 79.707 moles

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.