3 years ago

What is a force, provide an example

1 answer:

alexandr1967 [171]3 years ago

6 0

Answer:

A force involves an interaction between two or more objects, and it causes a push or pull between the objects. ... Good examples of opposing force include drag due to interaction with an air mass and the force due to friction between two objects.

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A compound consists of 75% magnesium and 25% oxygen. Find the empirical formula.

laila [671]

<h2>Answer:</h2>

% Composition of elements:

Magnesium = 75%
Oxygen = 25%

Atomic mass of given elements:

Magnesium = 24 g
Oxygen = 16 g

Now, divide % composition by Atomic mass:

$\footnotesize\implies Mg = \dfrac{\% \: Composition}{Atomic \: mass} = \dfrac{75}{24} = \bf 3.125$

$\footnotesize\implies O = \dfrac{\% \: Composition}{Atomic \: mass} = \dfrac{25}{16} = \bf 1.5625$

Simplest Ratio:

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$\footnotesize\implies O = \dfrac{1.5625}{1.5625} = 1$

Empirical Formula:

$\footnotesize\implies \underline{ \boxed{ \red{ \bf Empirical \: Formula = Mg_2O}}}$

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3 years ago

Ethylene glycol (antifreeze) has a density of 1.11 g/cm3. What is the mass in grams of 387 mL of ethylene glycol?

olga2289 [7]

Cm^3 = mL

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Density (g/mL) multiplied by volume (mL) will give us the mass (g)

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And since we have 3 significant figures, we have 430. g.

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