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jasenka [17]
3 years ago
10

How many protons, neutrons, and electrons does a magnesium atom with a mass number of 25 contain?

Chemistry
1 answer:
guapka [62]3 years ago
4 0
Protons: 12
Neutrons: 13
<span>Electrons: 12</span>
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If you start with 0.020 g of Mg, how many moles of H2 will you make if the reaction is complete?
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If one starts with 0.020 g of Mg, 0.0008 moles of H2 would be made if the reaction is complete.

Going by the balanced equation of reaction in the image, 1 mole of Mg will produce 1 mole of H2 in a complete reaction.

If 0.020 g of Mg is started with:

mole of Mg = mass/molar mass

                        = 0.020/24.3

                            = 0.0008 moles

Since the mole of Mg to H2 is 1:1, thus, 0.0008 moles of H2 will also be made from the reaction.

More on stoichiometry can be found here: brainly.com/question/9743981

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2 years ago
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Answer:

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Names: carbon-14, C-14, radiocarbon

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Half-life: 5,730 ± 40 years

Symbol: 14C

Explanation:

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2.20 M means there are 2,20 mol of NaOH in 1 000 mL of solution. We can use this proportion as a conversion factor:

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