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EastWind [94]
3 years ago
7

An atom has 13 protons and 14 neutrons. What is its mass number?

Chemistry
2 answers:
Maslowich3 years ago
8 0

you add 13 and 14 and get 27 because It is the total amount.
Hitman42 [59]3 years ago
3 0
Protons have a mass of 1
Neutrons have a mass of 1

So 13*1 + 14*1 = Mass number 27
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Which reactant will be used up first if 78.1g of o2 is reacted with 62.4g of c4h10?
dlinn [17]

Answer:

Reagent O₂ will be consumed first.

Explanation:

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Then, by reaction stoichiometry, the following amounts of reactants and products participate in the reaction:

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The molar mass of the compounds that participate in the reaction is:

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Then, by reaction stoichiometry, the following mass quantities of reactants and products participate in the reaction:

  • C₄H₁₀: 2 moles* 58 g/mole= 116 g
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  • H₂O: 10 moles* 18 g/mole= 180 g

If 78.1 g of O₂ react, it is possible to apply the following rule of three: if by stoichiometry 416 g of O₂ react with 116 g of C₄H₁₀, 62.4 g of C₄H₁₀ with how much mass of O₂ do they react?

mass of O_{2} =\frac{416grams of O_{2}*62.4 grams ofC_{4}H_{10}   }{116 grams of C_{4}H_{10}}

mass of O₂= 223.78 grams

But 21.78 grams of O₂ are not available, 78.1 grams are available. Since you have less mass than you need to react with 62.4 g of C₄H₁₀, <u><em>reagent O₂ will be consumed first.</em></u>

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2 years ago
An ion with a charge of +3 would most likely be an element in Group ____.
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