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77julia77 [94]
3 years ago
5

Which term describes the sum of the number of protons and neutrons in an atom?

Chemistry
2 answers:
topjm [15]3 years ago
8 0

<u>Answer: </u>The term is Mass number.

<u>Explanation:</u>

Atomic number is defined as the number of protons or number of electrons present in an atom. It is represented as Z.

Z = Number of protons = Number of electrons

Mass number is defined as the sum of number of protons and neutrons in an atom. It is represented as A.

A = Number of proton + Number of neutrons

Hence, the correct answer is Mass number.

Alecsey [184]3 years ago
4 0
Protons+Neutrons = Mass Number
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Hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer indu
ddd [48]

<u>Answer:</u> The amount of heat released is 56 MJ.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}  

Given mass of C_2H_6 = 12 kg = 12000 g    (Conversion factor: 1 kg = 1000 g)

Molar mass of C_2H_6 = 30 g/mol

Putting values in above equation, we get:

\text{Moles of }C_2H_6=\frac{12000g}{30g/mol}=400mol

The chemical reaction for hydrogenation of ethene follows the equation:

C_2H_4+H_2\rightarrow C_2H_6

By Stoichiometry of the reaction:

When 1 mole of ethane releases 140 kJ of heat.

So, 400 moles of ethane will release = \frac{140}{1}\times 400=56000kJ of heat.

Converting this into Mega joules, using the conversion factor:

1 MJ = 1000 kJ

So, \Rightarrow 56000kJ\times (\frac{1MJ}{1000kJ})=56MJ

Hence, the amount of heat released is 56 MJ.

8 0
3 years ago
What propertys does the rock state-of -matter have that wont let Logan poke his finger through it?
adell [148]
A rock is a solid, so Logan can't poke his finger through it.
4 0
3 years ago
In the lab you find four bags; each contains 5.00 g of a different gas at STP. The gases are O2, CH4, CO2, and He. Which bag has
hichkok12 [17]

Answer:

lesser the molar mass of the gas higher the no. of moles included in a certain mass sample. ie at STP more volume is required for the gas having less molar mass.

He has the smallest molar mass.

Therefore bag of He is the biggest.

4 0
3 years ago
Demand decreases and competition increases are factors that cause a shift in the quantity supplied (true or false)
Pavlova-9 [17]

Answer is: true.

Demand decreases and competition increases decrease the quantity supplied.

Quantity supplied is the quantity of a commodity that producers are willing to sell at a particular price at a particular point of time.

Quantity demanded is the quantity of a commodity that people are willing to buy at a particular price at a particular point of time.

Quantity demanded can change at the same price depending upon factors like recession, changes in the taste of the consumer.

Competition is rivalry between two or more economic groups.

4 0
3 years ago
Identify ALL the possible mol ratio from<br> this balanced equation:
grandymaker [24]

Answer:

\frac{1 mole of N_{2} }{3 moles of H_{2} }

Explanation:

The equation of the reaction:

   Nitrogen gas N₂ reacts with Hydrogen as H₂ to produce ammonia NH₃;

 

          N₂    +    H₂    →    NH₃  

 The balanced equation is ;

        N₂    +    3H₂    →    2NH₃  

The mole ratio is the ratio of the coefficients of the combining reactants;

   1 mole of N₂ combines with 3 mole of H₂;

So;

      \frac{1 mole of N_{2} }{3 moles of H_{2} }

3 0
2 years ago
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