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3 years ago

In a lab, the mass of object A is 65 kg. Object A weighs:

Chemistry

2 answers:

gavmur [86]3 years ago

8 0

637
65 times 9.8
Mass times gravitational strength equals weight

Svet_ta [14]3 years ago

3 0

Answer is: (C)- 637 N.

Gravity as a force which causes any two bodies to be attracted to each other.

The gravitational effect increases as the size of an object increases. Earth s surrounded by its own gravitational field.

The weight of an object is the amount of force acting on the object due to gravity. SI unit for weight is newton (N).

m(object) = 65 kg.

g = 9.8 m/s²; the acceleration of free fall.

W = m·g.

W = 65 kg · 9.8 m/s².

W = 637 N; weight of the object A.

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3 years ago

In an aqueous solution of a certain acid the acid is 4.4% dissociated and the pH is 3.03. Calculate the acid dissociation consta

NeX [460]

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4.1x10⁻⁵

Explanation:

The dissociation of an acid is a reversible reaction, and, because of that, it has an equilibrium constant, Ka. For a generic acid (HA), the dissociation happens by:

HA ⇄ H⁺ + A⁻

So, if x moles of the acid dissociates, x moles of H⁺ and x moles of A⁻ is formed. the percent of dissociation of the acid is:

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But x = [A⁻], so:

[A⁻]/[HA] = 0.044

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