One atom of lithium, Li, reacts with fluorine, F, to produce lithium fluoride, LiF2. The atomic mass of lithium is 7 amu. The mass of one atom of lithium fluoride is 45 amu. Which statement about the reaction is correct? Lithium reacts with two atoms of fluorine, and the atomic mass of fluorine is 38 amu.   Lithium reacts with two atoms of fluorine, and the atomic mass of fluorine is 19 amu.   Lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 38 amu.   Lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 19 amu.

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: What is the radius (in cm) of a pure copper sphere that contains 1.14 * 1024 copper atoms? [The…

A: Given information:

Q: How many atoms are contained in a titanium sphere having a diameter of 4.00 mm? The density of…

A: Given : density of titanium = 4.506 g/cm3  And diameter of sphere = 4.00 mm  Since 1 cm = 10 mm…

Q: During nuclear decay a 238 U atom can break apart into a helium 4 atom and one other atom. Assuming…

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Q: The mass ratio of sodium to fluorine in sodium fluoride is 1.21:1. A sample of sodium fluoride…

A: After the decomposition of sodium fluoride, the mass of fluorine produced is calculated by using the…

Q: A pure titanium cube has an edge length of 2.78 in. How many titanium atoms does it contain?…

A: Edge length = 2.78 inch, 1 inch = 2.54 cm 2.78 inch = 2.54 × 2.78 = 7.061 cm Density of unit cell =…

Q: A 64.36 g sample of XO2 contains 25.79 g of oxygen atoms. What is element X?

A: Given,      A 64.36 g sample of XO2 contains 25.79 g of oxygen atoms . To determine the identity…

Q: Carbon exists as 3 isotopes. It is 88% C-12, 1% C-13 and 11% C-14. What is the average atomic mass…

A: average atomic mass= isotop% multiplied by atomic mass /100

Q: When barium (Ba) reacts with sulfur (S) to form barium sulfide (BaS), each Ba atom reacts with an S…

A: Calculate the amount of S. Mass of the sulfur=Volume (density) Mass of the sulfur=1.75 cm3(2.07…

Q: Suppose the diameter of a type of atom is 2.22 x 10-7 mm. A coin has diameter 1.20 cm. Suppose the…

A: If we divide the diameter of a coin by the diameter of an atom we will get the no. of atoms.  Given…

Q: 5. Calculate the average atomic mass of Nitrogen (verify in the periodic table) 14N 14.003 u 99.6%…

A: Given,  14N      14.003 u         99.6% 15N      15.000 u          0.4%

Q: Titanium has five common isotopes: 46 Ti (8.0%), 47 Ti (7.8%), 48Ti (73.4%),49Ti (5.5%), 50Ti…

A:

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: An unknown element X has the following isotopes: 1ºX (20.00% abundant, atomic mass = atomic mass =…

A:

Q: An unknown element X has the following isotopes: ²⁵X (80.50% abundant, mass = 25.03 amu) and ²⁷X…

A:

Q: If 4 Kg of Gallium (Ga) is reacted with 11 Kg of Nitrogen (N). what mass of GaN will be formed? The…

A: We have given 4 Kg = 4000 g of Gallium (Ga) which is reacted with 11 Kg = 11000 g of Nitrogen (N2).…

Q: How many atoms are contained in a block of aluminum metal measuring 4.0 mm x 9.0 mm x 11 mm? The…

A:

Q: Copper has 2 stable isotopes, namely Cu-63 and Cu-65. The atomic masses of the said isotopes are…

A:

Q: Natural gallium, which has an atomic weight of 69.7230 amu, consists of gallium-69 and gallium-71…

A:

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: A pure copper cube has an edge length of 2.76 cm How many copper atoms does it contain? (volume of…

A: Density of a unit cell is given by, Density = Z×Ma3×NA where, Z is the number of atoms in the unit…

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

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Q: Bulk platinum cost about $1158 dollars per ounce (28.35 g = 1 ounce) how much would it cost to…

A:

Q: Naturally occurring bromine is composed of two isotopes: 50.69 % Br-79 (mass of 78.9183 amu) and…

A: Given,Naturally occurring bromine is composed of two isotopes:50.69 % Br-79 (mass of 78.9183 amu)…

Q: A sample of manganes reacts completely with oxygen in a specialized crucible. The reaction is given…

A: Given reaction: To find: The charge on manganese. Balanced chemical equation.

Q: Determine the mass (in grams) of aluminum present in 1.08 grams of Al2S3?

A: Molar mass of the elements is equal to the sum of the atomic masses of all the elements. Molar mass…

Q: Upon decomposition, one sample of magnesium fluoride produces 1.66 kg of magnesium and 2.58 kg of…

A: The values are given as follows:

Q: Determine the mass of Strontium-86 (in u) given that the average atomic mass of Sr is 87.6126 u and…

A:

Q: Naturally occurring chlorine is composed of two stable isotopes namely Cl 35 (75.76 %) and Cl 37…

A:

Q: A pure copper sphere has a radius of 0.935 in. How many copper atoms does it contain? [The volume of…

A: First convert the given radius in inch to cm. 1 inch = 2.54 cm, then

Q: A pure copper sphere has a radius 0.927 in . How many copper atoms does it contain? [The volume of a…

A: The term density is defined as the ratio of mass and volume of the given substance. It can also be…

Q: How many atoms are contained in a block of aluminum metal measuring 6.0 mm x 5.0 mm x 15 mm? The…

A:

Q: 5. A sample of Magnesium contains three isotopes and its average atomic weight is 24.35 amu. If the…

A:

Q: Upon decomposition, one sample of magnesium fluoride produced 2.55 kg of magnesium and 3.99 kg of…

A: Given information, Magnesium is produced from the first sample is 2.55 kg. Fluorine is produced from…

Q: The mass ratio of sodium to fluorine in sodium fluoride is 1.21:1. A sample of sodium fluoride…

A: Given : Mass ratio of sodium to fluorine in sodium fluoride = 1.21 : 1  And mass of sodium produced…

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.