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EleoNora [17]
2 years ago
9

A reaction gives off 35.6 kJ how many calories is this?

Chemistry
1 answer:
tia_tia [17]2 years ago
7 0
8.509 kilocalories I think
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1) List the number of protons, neutrons, and electrons in Carbon-13.
ser-zykov [4K]
1) Carbon-13: 
                      Proton-6     Neutron-7       Electron-6

2)Atomic mass of element X:
   (55*10+56*20+57*70)/100=56.6
4 0
3 years ago
3Fe+4H2O(yields) Fe3O4+4H2. What is the mole ratio of Fe3O4 to Fe?
WINSTONCH [101]

<u>Answer:</u> The correct answer is Option A.

<u>Explanation:</u>

Mole ratio is defined as the ratio between the stoichiometric coefficients of the molecules present in the chemical reaction.

For the given balanced chemical equation:

3Fe+4H_2O\rightarrow Fe_3O_4+4H_2

By Stoichiometry of the reaction:

3 moles of iron metal reacts with 4 moles of water to produce 1 mole of iron oxide and 4 moles of hydrogen gas.

The mole ratio of Fe_3O_4:Fe=1:3

Hence, the correct answer is Option A.

7 0
3 years ago
Read 2 more answers
Decide if the following definite article and noun agreement is CORRECT or INCORRECT <br> La mapa
GREYUIT [131]
It's el mapa so the answer is incorrect. Even though mapa has an 'a' at the end, you will still use el.
8 0
3 years ago
Read 2 more answers
SEP Develop Models Each helium atom has two protons. Sketch models
RSB [31]

Protons and neutrons are located in the nucleus of the atom while the electrons move in the trajectory of the shell

<h3>Further explanation   </h3>

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.  

So Isotopes are elements that have the same Atomic Number (Proton)  

Isotopes of Helium : helium-3 and helium-4

  • ₂³He :

protons = 2

electrons=protons=2

neutron=mass number-atomic number=3-2=1

  • ₂³He :

protons = 2

electrons=protons=2

neutron=mass number-atomic number=3-2=1

  • ₂⁴He

protons = 2

electrons=protons=2

neutron=mass number-atomic number=4-2=2

Protons and neutron in the nucleus, electrons in the shell

6 0
3 years ago
How many moles are in 8.35 g of H2O?
AlexFokin [52]
It’s is 130 that is the answer!!!!
8 0
1 year ago
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