3 years ago

How many atoms are in oxygen

Chemistry

1 answer:

Aleonysh [2.5K]3 years ago

4 0

There are only 2 atoms in an Oxygen molecule

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Which of the following is not an example of a molecule?

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Explanation:

A molecule is the smallest physical unit of a substance that can exist independently, consisting of 2 or more atoms chemically combined

He is one atom of Helium

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3 years ago

Atomic number and mass of H

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The atomic number of Hydrogen is 1, and the mass is 1.008.

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N2 (g) + __ H2 (g) --> _NH3 When the reaction above is completely

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Answer:

Explanation:

left side has 2 N so right side must have a 2 which means 6 H on right side so to get 6 on left you have a coef. of 3 to make 6 H

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3 years ago

Inertia is _____ to mass

Arisa [49]

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directly proportional

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3 years ago

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The cylinder of aluminum in class was approximately 13mm in circumference and 42mm in length. What would be it's approximate mas

Roman55 [17]

Answer:

Mass, m = 1.51 grams

Explanation:

It is given that,

The circumference of Aluminium cylinder, C = 13 mm = 1.3 cm

Length of the cylinder, h = 4.2 cm

We know that the density of the Aluminium is 2.7 g/cm³

Circumference, C = 2πr

$r=\dfrac{C}{2\pi}\\\\r=\dfrac{1.3}{2\pi}\\\\r=0.206\ cm$

Density is equal to mass per unit volume.

$d=\dfrac{m}{V}$

m is mass of the cylinder

V is the volume of the cylinder

$V=\pi r^2h\\\\V=\dfrac{22}{7}\times0.206^2\times 4.2\\\\V=0.5601\ cm^3$

So,

$m=d\times V\\\\m=2.7\times 0.5601\\\\m=1.51\ g$

So, the mass of the cylinder is 1.51 grams.

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4 years ago