1. How many calories are released when 100. g of steam condenses? The heat of condensation for water is 540 cal/g . #2 Consider an atom with 30 protons and 34 neutrons. List the atomic number and the mass number (in order) of that element.  a.30, 64 b.64, 4 c.34, 30 d.30, 34

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A: The position of the element strontium in the periodic table is marked in the diagram of the periodic…

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A: Metal are hard , shiny, magnetic , and a good conductor of electricity .

Q: Question attached

A: When two atoms have same atomic number and different mass number, they are called as isotopes.

Q: 9. What 9. What is the difference between a molecular element and an atomic element? List the…

A: Element is a substance which cannot be broken down into simpler unit.It is purest form any…

Q: (Law of Conservation of Mass) A 0.455 g sample of magnesium is allowed to burn in 2.315 g of oxygen…

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A: Assuming the molecular formula of compound is CaHbOc  And since moles = mass / molar mass Hence…

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A:

Q: À 7.45 g sample of calcium carbonate completely decomposes into calcium oxide (lime) and carbon…

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A:

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A: "Since there are multiple sub-parts in this question and it is not mentioned that which one has to…

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Q: Consider two compounds. Compound A contains 2.77 g of phosphorus and 9.53 g of chlorine. Compound B…

A: Given,Mass of Phosphorus in compound B =11.9gMass of chlorine in compound B =40.9g

Q: The density of copper is 8.96 g/cm3. How many copper atoms are in a sphere with a volume of 0.475…

A: Mass = Volume x density Number of moles = Mass in gram/Molar mass Number of atoms = Number of moles…

Q: Show your calculations clearly. Suppose you are provided with a 36.55 g sample of potassium…

A:

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A: The average atomic mass of two isotopes can be calculated using the following expression:

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A: Mass number Mass number gives the number of protons and neutrons in an atom.

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A: The atomic structure of the element is shown below. In the above atomic, the element has two…

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A: 1. Atomic mass indicates mass of an atom. Single atom has set of protons , neutrons and electrons.…

Q: a) How many protons does Promethium-145 have? b). How many neutrons does Promethium-145 have?…

A: Given :  Mass number of Promethium = 145  Atomic number of Promethium = 61  Half life of Promethium…

Q: (1. On the second floor of Kent Laboratory a chemistry student in 111B finds that 15.20 g of…

A: Given information:Mass of nitrogen = 15.20 gMass of oxygen for different compounds = 17.37 g, 34.74…

Q: 6. The precise mass of a compound was determined by high resolution mass spec to be 84.0575. Using…

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Q: It is discovered that it contains 7.759 %  by mass of  of the element oxygen (molar mass 16.00…

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Q: According to the law of conservation of matter, what happens to the atoms in a chemical reaction?…

A: (a) The atoms are rearranged with no loss in mass

Q: 2 N205 (s) 54 NO, (g) + 02 (g) AG;° (kJ/mol) N2O5 (s) 117.7 NO2 (g) 51.8

A: From the standard Gibbs free energy data □G° = [Total Gibbs free energy of products] - [Total Gibbs…

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A: In a neutral atom the number of electrons and protons are same.

Q: 100% Normal text Oxygen 12 ... 3. The atomic masses of elements are generally not whole numbers.…

A: Concept is based on isotopes:     As per our guideline we have to answer first question only.

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Q: How are isotopes of an element identical to one another? How are they different from one another

A: Isotopes of an element is defined as atoms of same element having different mass Number but same…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.