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Citrus2011 [14]
3 years ago
12

An atom has 25 protons,20 neutrons, and 19 electrons.Which atom is this,What is the atom's mass number?

Chemistry
2 answers:
ladessa [460]3 years ago
6 0
The atomic mass is 45
Arte-miy333 [17]3 years ago
3 0
The atom is manganese
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According to Le Chatelier’s principle, what happens when the concentration of reactants is doubled in a chemical reaction that w
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According to Le Chatelier’s principle, if the dynamic equilibrium of a system is disturbed by any change in the conditions of the system then the equilibrium will adjust itself in such a way that new equilibrium moves to counteract the change.

Hence, when the concentration of reactants is doubled in a chemical reaction that was in equilibrium then the equilibrium shifts to the right to favor the formation of products.


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Which sentence from “Broken Chain” contains the most descriptive language? “He asked his mother if he could have braces, like Fr
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" At four he decided to get it over with and started walking to Sandra's house, trudging slowly, as if he were waist-deep in water. "

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• Unit; mg/L (milligrams per liter)

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I WILL GIVE BRAINLIEST!
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(a) 4.12 x 10^15 atoms U
DochEvi [55]

Answer:

1.63ₓ10⁻⁶ g of U

139.03 g of H

0.385 g of O

141.8 g of Pb

Explanation:

In first place, we need to convert the number of atoms to moles, as we know that 1 mol of anything occupies 6.02×10²³ particles

Therefore:

4.12×10¹⁵ atoms of U . 1 mol / 6.02×10²³ atoms = 6.84×10⁻⁹ moles of U

8.37×10²⁵ atoms of H . 1 mol /6.02×10²³ atoms = 139.03 moles of H

1.45×10²² atoms of O . 1 mol /6.02×10²³ atoms = 0.0241 moles of O

4.12×10²³ atoms of Pb . 1 mol /6.02×10²³ atoms = 0.684 moles of Pb

Moles . Molar mass = Mass (g)

6.84×10⁻⁹ moles of U . 238.03 g/mol = 1.63ₓ10⁻⁶ g of U

139.03 moles of H . 1 g/mol = 139.03 g of H

0.0241 moles of O . 16 g/mol = 0.385 g of O

0.684 moles of Pb . 207.2 g/mol = 141.8 g of Pb

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