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tamaranim1 [39]
3 years ago
8

The acceleration due to gravity on earth is 9.80 m/s2. if the mass of a dog is 40.0 kg, what is the weight of the dog? 4 n 40 n

392 n 490 n
Chemistry
2 answers:
PSYCHO15rus [73]3 years ago
7 0

Answer: The Weight of the dog is 392 N.

Explanation:

Acceleration due to gravity ,(g): 9.80m/s^2

Mass of the dog,(m) = 40 Kg

Weight is measure of force exerted by gravity on the object. Its S.I units are Newtons (kg\times m/s^2)

Weight= mass × g

40\times 9.80m/s^2=392 N

Hence, the weight of the dog is 392 N.

Elden [556K]3 years ago
3 0
Weight = mass * acceleration

W = 40*9.8

= 392N
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CH₃NH₂ + HCl ↔ CH₃NH₃⁺ + Cl⁻

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             CH₃NH₃⁺ + H₂O → H₃O⁺ + CH₃NH₂
I                0.11                       0             0
C               -x                          +x           +x
E            0.11 - x                     x             x

Ka = [H₃O⁺][CH₃NH₂]/[CH₃NH₃⁺]

Since the given information is Kb, let's find Ka in terms of Kb.

Ka = Kw/Kb, where Kw = 10⁻¹⁴

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Ka = 10⁻¹⁴/5×10⁻⁴ = 2×10⁻¹¹ = [H₃O⁺][CH₃NH₂]/[CH₃NH₃⁺]
2×10⁻¹¹ = [x][x]/[0.11-x]
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x = 1.483×10⁻⁶ = [H₃O⁺]

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pH = -log(1.483×10⁻⁶)
<em>pH = 5.83</em>


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