A sample of 5.000 g of nitrogen can be combined with 5.714 g of oxygen to form nitric oxide gas (NO). What mass of oxygen would be required to convert the same sample of nitrogen to nitrogen dioxide (NO2) instead?

Q: Assuming that the shape of atoms is spherical, what is the diameter (in angstroms) of an atom that…

A: A multiple choice question based on atomic structure, which is to be accomplished.

Q: A sample of mercury with a mass of 114.0 g was combined with 12.8 g of oxygen gas, and the resulting…

A: The reaction taking place is  2 Hg + O2 -----> 2 HgO Hence from the above reaction we can say…

Q: If you wanted to make an accurate scale model of the hydrogen atom and decided that the nucleus…

A: Answer :

Q: The mass of 6 million molecules of a diatomic gas is 5.1  × 10-19 kg. What is the atomic mass of the…

A: Mole concept: The number of molecules or atoms present in the one mole of the substance is equal to…

Q: The U.S. Environmental Protection Agency (EPA) sets limits on healthful levels of air pollutants.…

A: The number of lead atoms can be calculated as follows:

Q: Which elements are alkaline earth metals?(a) rubidium(b) tungsten(c) magnesium(d) cesium(e)…

A: Alkaline earth metals are the elements present in the group 2 of the periodic table. Their general…

Q: What are the 50 elements and their symbols?

A: An atom is the basic and fundamental unit of matter. An atom consists of electron and the nucleus in…

Q: From the information in this chapter on the mass of the proton, the mass of the electron, and the…

A:

Q: What element is found in period 4, group 4A? Use the atomic symbol to identify the element.

A: Given : Period of element is 4  Group of element is 4 A.

Q: 1. How many calories are released when 100. g of steam condenses? The heat of condensation for water…

A: Given: Mass of water = 100 g The heat of condensation for water = 540 Cal/g

Q: How and by whom was the electron discovered? What basic properties of the electron were reported…

A: Models for electrons- J.Thomson in 1897 discovered electron with the help of cathode ray tube…

Q: Calculate the mass, in grams, of each sample. a. 1.1 x 10 gold atoms b. 2.82 x 102 helium atoms c.…

A: Calculate the mass in grams of each sample  (a) 1.1 x 1023 gold atoms (b) 2.82 x 1023  helium atoms…

Q: The radius of a strontium atom is 215 pm. How many strontium atoms would have to be laid side by…

A: Diameter = 2 X Radius

Q: A sample of magnesium is found to contain 78.70% of 24Mg atoms (mass 23.98 amu), 10.13% of 25Mg…

A: The atomic mass of an element is the average of masses of all the isotopes of that element present…

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

A: According to Law of conservation of mass total mass of reactants is equal with the total mass of…

Q: Given a 240.0 g sample of sulfur trioxide, how many grams of oxygen are produced, assuming the…

A: Number of moles of SO3 = mass / molar mass Number of moles of SO3 = 240 g / 80.066 g / mol = 2.99…

Q: Describe Thomson’s model of the atom. How might it account for the production of cathode rays?

A: To find: The Thomson's model of the atom.  How might it account for the production of cathode rays

Q: Which of the following elements would be classified as a nonmetal? a.) silicon  b.) francium c.)…

A:

Q: atoms

A:

Q: 2.90 grams of phosphorus is burned in the presence of oxygen and forms 5.14 grams of a phosphorus…

A: We can just subtract the mass of the phosphorus from the mass of phosphorus oxide and get mass of…

Q: Write chemical formulaS (a) Na" and NO, (b) Fe+ and CO, (c) Ba* and NO, (d) Al and CIO,

A:

Q: The radius of a tantalum atom is 142 pm. How many tantalum atoms would have to be laid side by side…

A: Given: Radius of tantalum atom = 142 pm And total distance given = 2.85 mm.

Q: Which pair of elements would you expect to exhibit the greatest similarity in their physical and…

A: Periodic table represents the systematic arrangement of elements in which the properties of these…

Q: Are electrons, protons, or neutrons the smallest particles? If not, what are?

A: We need to determine wheather  electron, proton or neutron are the smallest particle or not.

Q: The elements in Groups 1A(1) and 7A(17) are all quite reactive. What is a major difference between…

A: The elements in Groups 1A(1) and 7A(17) are all quite reactive. What is a major difference between…

Q: Determine the number of atoms that would make up a 78.8 g sample of Tellurium.

A:

Q: The diameter of a U.S. dime is 17.9 mm, and the diameter of a silver atom is 2.88 A° . How many…

A: The diameter of a U.S. dime is 17.9 mm = 0.0179  meter  diameter of a silver atom is 2.88 A°  =…

Q: estion 19 A 20.0 g sample of an element contains 4.95 x 1023 atoms. Identify the element. O Mg O Fe…

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Q: 1. Determine the number of electrons necessary to equal a mass of 1.15 x 10 grams.

A:

Q: Which of the following elements would have chemical properties similar to Ca   K, Ba, Kr, or Sc

A: Elements from same group have same chemical properties

Q: the history of the discovery of hydrogen and what properties they observed to identify it

A: Position of hydrogen in periodic table:   Hydrogen is regarded as rogue / disputable element because…

Q: with an atomic weight of 29.9738 amu. On the basis of these data, confirm that the average atomic…

A: We need to find the average atomic weight on the basis of given weights and percentage composition

Q: What element is x? O Mercury O Bromine O Rhodium O Xenon O Ytterbium

A:

Q: A sample of 6.000 g of nitrogen can be combined with 6.857 g of oxygen to form nitric oxide gas…

A: To Find: To find out the mass of oxygen required to react with  nitrogen to form nitrogen dioxide.

Q: A bicycle part made of titanium, Ti, has a volume of 32 cm . Titanium has a density of 4.50 g/cm .…

A:

Q: Which pair of elements would you expect to exhibit the greatest similarity in their physical and…

A: The properties of elements are dependent over their electronic distribution. The similarity in the…

Q: How many moles of titanium are present in 124 g of titanium?

A:

Q: A sample of 4.000 g of nitrogen can be combined with 4.571 g of oxygen to form nitric oxide gas…

A: In nitric oxide, the ratio of N and O is = N : O = 1 : 1.                                      (mole…

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…

Q: The mass percentage of oxygen in 5.5 g M9SO.7H;0 equals : a. 57.7% 71.5% c. 63.5% d. 55.8%

A: Mass percent :- The mass (in grams) of an element present in 100 grams of the compound is defined as…

Q: The radius of a tantalum atom is 142 pm. How many tantalum atoms would have to be laid side by side…

A: The radius of tantalum atom =142 pm=142 x 10-12 m 1 pm = 10-12 m Diameter of tantalum atom =2 x 142…

Q: A sample of an oxide of antimony (Sb) contained 39.5 g of antimony combined with 13.0 g of oxygen.…

A: Given: Mass of antimony (Sb)= 39.5 g Mass of oxygen= 13.0 g

Q: The radius of a tungsten atom is 137 pm. How many tungsten atoms would have to be laid side by side…

A: Given :- radius of tungsten atom = 137 pm  To calculate :- number of tungsten atoms in 1.99 mm

Q: How many electrons are in 1 coulomb?

A: Particles that reside inside an atom are called subatomic particles. These particles are electrons,…

Q: Which statements are true? A. There are 11 elements represented in the periodic table by letters…

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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.