Answer:
12 moles H2O
Explanation:
Your tools of choice for stoichiometry problems will always be the mole ratios that exist between the chemical species that take part in the reaction.
As you know, the stoichiometric coefficients attributed to each compound in the balanced chemical equation can be thought of as moles of reactants needed or moles of products formed in the reaction.
In your case, the balanced chemical equation for this synthesis reaction looks like this
2H2(g]+O 2(g]→2H2O(l]]
Notice that the reaction requires
2
moles of hydrogen gas and
1
mole of oxygen gas to produce
2
moles of water.
This tells you that the reaction produces twice as many moles of water as you have moles of oxygen gas that take part in the reaction.
You know that your reaction uses
6.0
moles of oxygen. Assuming that hydrogen gas is not a limiting reagent, you can say that the reaction will produce
6.0
moles O
2⋅2
moles H
2O1
moles O
2=
12 moles H2O
Answer:
The answer to your question is carbon. The masses of all isotopes are based on a comparison to the mass of a particular isotope of carbon123. This isotope is carbon-12, which has six protons and six neutrons in its nucleus. By definition, one atom of carbon-12 is assigned a mass of exactly 12 atomic mass units (amu), which is a unit of mass equal to one twelfth of an atom of carbon-1212. All other isotopes have their masses expressed as a fraction or a multiple of this standard unit. For example, the isotope hydrogen-1 has a mass of 1.0078 amu, which means it is slightly heavier than one twelfth of carbon-12. The isotope uranium-238 has a mass of 238.0508 amu, which means it is almost 20 times heavier than carbon-12. The reason why carbon-12 was chosen as the reference standard is because it is abundant, stable, and easy to measure3. I hope this answer helps you understand the concept of isotopes and atomic mass better.
Answer:
a) Halophile
Explanation:
Halophiles are extremophiles characterized by their ability to thrive in very hot and salty conditions, such as salt flats, salt mines, or hypersaline environments. They have adapted to high levels of salt and can withstand extreme salinity.
After a radioactive atom decays, it is the same element that it was before with no measurable change in mass. the decay that is present is gamma decay because gamma decay has photons which has no mass unlike alpha and beta decay.
Answer:
D
Explanation:
on edge 2020
b. one millionth of a gram
c. approximately the mass of a proton
d. approximately the mass of an electron
(2) 79 (4) 197
The atomic number of an element is the number of its protons. Here, the total number of electrons is 79 and thus the element s having 79 protons also. Thus, option 2 is correct.
An atom is composed of nucleus and and electrons. Protons and neutrons are located inside the nucleus. Electrons are revolving around the nucleus.Electrons are negatively charged particles and protons are positively charged whereas neutrons are neutral.
The atomic number of an element is the number of its electrons or protons. For a neutral atom the number of electrons and protons are equal. Thus all the positive charges are neutralized by equal number of negative charges.
The electrons are filled in different orbitals and from the configuration we can understand the number of electrons given is 79. Thus its number of electrons and protons is 79.
Hence, the number of protons for the element with the given electronic configuration is 79. The name of this element is gold.
To find more about protons, refer the link below:
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