Chemistry: Q#1.)according to newton second law of motion, if we have a rigid body of uncharged mass is observed acceleration, what must be happening? a.a force was once applied but is now not being applied . b.a force is being applied to the mass. c. no force was or is being applied to the mass. d. the mass must be changing.

Q#1.)according to newton second law of motion,

briandgonzalezk

04.03.2023

1.2044 x 10²⁴ atoms.

Explanation:

We need to calculate the no. of moles of Ca that are present in 80.156 g using the relation:

n = mass/atomic mass = (80.156 g)/(40.078 g/mol) = 2.0 mol.

It is known that every 1.0 mole of a molecule contains Avogadro's number of molecules (NA = 6.022 x 10²³).

Using cross multiplication:

1.0 mole of Ca contains → 6.022 x 10²³ atoms.

2.0 moles of Ca contains → ??? atoms.

∴ 2.0 mole of (80.156 g) Ca contain = (2.0 mol)(6.022 x 10²³) = 1.2044 x 10²⁴ atoms.

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