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3 years ago

A reaction produces 0.875 moles of h2o. how many molecules are produced?

1 answer:

3 0

<span>Avogadro's constant/number is 6.022 Ă— 10^23 molecules for every 1 mole of substance. And reaction produces 0.875 moles of h2o. So, Number of molecules produced = Avagardo's number x Number of moles of h2o produced. Number of molecules produced = (6.022 Ă— 10^23) x (0.875) Number of molecules produced =5.26925 Ă—10^23 molecules.</span>

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Karolina [17]

Explanation:

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3 years ago

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ivann1987 [24]

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3 years ago

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11111nata11111 [884]

Formula mass, molar mass and Avagadro's number.

Explanation:

number of atoms in a compound can be calculated by knowing the molar mass of the compound or element, the result will be multiplied by avagadro's number (6.022*10^23)

1 mole of a substance is equal to Avagadro number of atoms.

If the number of moles is known of a compound or element its molar mass can be calculated as:

n= Weight of the compound/element given/ molecular weight of the same.

formula mass is the mass of compound ie chemical compound formed with different molecules. its mass is calculated by adding the molar masses of all the elements taking part in its assembly.

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4 years ago

The radius of a vanadium atom is 130 pm. How many vanadium atoms would have to be laid side by side to span a distance of 1.30 m

monitta

Answer:

5 000 000 (5 million atoms)

Explanation:

Let us assume that a vanadium atom has a spherical shape.

diameter of a sphere = 2 x radius of the sphere

Thus,

Radius of a vanadium atom = 130 pm

= 130 x $10^{-12}$ m

The diameter of a vanadium atom = 2 x radius

= 2 x 130 x $10^{-12}$

= 260 x $10^{-12}$ m

Given a distance of 1.30 mm = 1.30 x $10^{-3}$ m,

The number of vanadium atoms required to span the distance = $\frac{1.3*10^{-3} }{260*10^{-12} }$

= 5000000

Therefore, the number of vanadium atom that would span a distance of 1.30 mm is 5 million.

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3 years ago

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elena-s [515]

The answer is sodium hydroxide

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3 years ago