(a) What percentage of the electrons originally in the cube was removed? % (b) By what percentage has the mass of the cube decreased because of this removal? %

Q: w hydrogen atoms

A:

Q: 5 g of anhydrous strontium nitrate is added to a beaker and exposed to the air. After several hours…

A: The percentage of water in hydrated sample is given as : Percentage of water = ( mass of water /…

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A: Hi, since you have posted questions with multiple subparts. We will answer the first three subparts…

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A: To Solve this problem we will the given balanced chemical equation.  First we will find the limiting…

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Q: Consider the hypothetical reaction of the real-life element iron and the fictional element vibranium…

A: Solution:- Given:- Reaction > Fe + Vi →Fe4Vi3  Balanced chemical equation:- 4Fe + 3Vi → Fe4Vi3…

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A:

Q: Calculate the % by mass C in C4H8O

A: % by mass of C in C4H8O = (mass of C/mass of C4H8O) × 100%

Q: The density of solid Cr is 7.15 g/cm3. How many atoms are present per cubic centemeter of Cr?

A: Mass = Volume x density Number of moles = Mass/molar mass Number of molecules = 6.0224 x 1023 x…

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A: Uranium is a radioactive element which disintegrates spontaneously.

Q: Imagine you mix 16.05 g of methane (CH4) gas and 96.00 g ofoxygen (O2) gas and then ignite the…

A: First order reaction is a reaction that proceeds at a rate that depends linearly on only one…

Q: what mass of sodium is also produced?

A: Given :- 2Na3N → N2 + 6Na  Mass of N2 produced = 29.7 g  To calculate :-   Mass of sodium (in g)

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A: The symbol notation given is

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A: Mercury(II) Oxide looks like red solid. When it was heated to higher temperature, it will produce…

Q: A 0.214 gram sample of Magnesium (atomic weight = 24.31 g/mol) is oxidized in a crucible. The final…

A:

Q: The following diagram is a representation of 20 atoms ofa fictitious element, which we will call…

A: a.

Q: How many protons are contained in a circular puddle of liquid mercury that is 6.25 inches wide and…

A: In the given question we have to calculate the number of proton contained in a circular puddle of…

Q: 18.5 How many moles are in a 2.40 cm × 2.40 cm × 2.40 cm cube of copper?

A:

Q: The NH4+ and NO3− ions of ammonium nitrate are held together by_____ bonds. To separate these two…

A: Ionic bonds are formed by the complete transfer of one or more electrons to the other atom, thereby…

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Q: What is the mass in grams of 9.76 × 1012 atoms of naturally occurring potassium?

A: mass = 6.32 x 10-10 g

Q: The natural isotopes of sulfur and their molar masses and mass fractions are respectively 2210S:…

A:

Q: Matter is defined as ....... إجابتك Felite is إجابتك

A: 2. The term matter refers to anything that occupies space and has mass—in other words, the “stuff”…

Q: You have 3.31 L of water that contains 25 mg/L of PO43-. What is the total amount of phosphate in…

A: • The values provided in the question are:-    i) Density of phosphate ion solution,d  = 25 mg/L…

Q: I want to know at least some reason why the mass of the Mgo formed could be lower that expected

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A: Dalton's atomic theory are as follows  (1) Atoms are indivisible,tiny particle of same size and same…

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A: Avogadro's  number gives the number of atoms, molecules or ions in one mole of the substance and it…

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A: Mercury oxide is HgO.

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A: The diameter of the nucleus is given that 2 mm. The electron cloud or diameter of atom is 200m. That…

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A: The chemical formula - It is the representation of the chemical composition  of the compound

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A: The incorrect statement among the given has to be given,

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Q: It the type of energy that happens in the core of the atom   a. solar b. thermal c. nuclear d.…

A: Solar as the name suggest energy that come from heat and light of sun.

Q: does hydrogen exist as an atomic element in the air?

A: Interpretation: Does hydrogen gas exist as an atomic element in the air is to be determined.

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A:

Q: The isotope of plutonium "Pu is used to make thermoelectric power sources for spacecraft. Suppose…

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Q: atomic mass of an element related to its molar mass?

A:

Q: Calculate the mass of antimony(III) lodide, Sblg, that can be produced by the reaction of 143 g of…

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Q: A(n) _________ reliablypredicts the behavior of matter, while a(n) _________ providesan explanation…

A: a). Hypothesis is a prediction or a suggested explanation of an observable phenomenon. It has not…

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A:

Q: 8) 3.57g of Lithium Carbonate were produced produced, how many grams of Magnesium Nitride were as…

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Q: 8. How many milligrams of iron are delivered from a 250. mg tablet of FeSO,-7H,O? Percentage %CaCl,…

A: Q9) U3O8 molar mass                 Atomic mass of U =238       Atomic mass of oxygen =16…

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.