A 5.05 g sample of quartz (SiO2) contains 2.36 g of silicon. What are the percentages of silicon and oxygen in quartz?

Q: Tin, element 50 on the periodic table, has 10 stable isotopes. 117^Sn makes up 7.687% of naturally…

A: Using the formula moles of Sn117 is calculated as,

Q: One of the Freons, CCI₂F2, is manufactured from carbon tetrachloride and hydrogen fluoride. The…

A: Given,when CCl4 reacts with HF to form CCl2F2 and HCl.mass of CCl2F2 = 117 kgmass of CCl4 = 183…

Q: How many moles of Carbon (C) will be formed, given 0.1175 moles of Silicon (Si)? * 2 CO + 1 Si –1…

A: The mole is the measurement unit for the quantity of the material in the International System of…

Q: Calculate the mass in grams of a sample of NO2 that contains 1.000 x 10^25 molecules.

A:

Q: Cinnabar, mercury(II) sulfide, HgS, is mined as a primary source for elemental mercury. a. What is…

A: Given :  Mass of HgS = 7.5 x 105 kg  Also, atomic mass of mercury = 200.6  Molecular mass of HgS =…

Q: If 2 moles of water decomposes, the products that will form are 2 moles of hydrogen gas and one mole…

A: Given, Moles of water decomposed = 2 moles.

Q: Calculate the number of atoms per cubic meter in lead. The density and atomic weight of lead are…

A: Given,  The density and atomic weight of lead are 11.35 g/cm3 and 207.2 g/mol and the Avogadro's…

Q: Lithium has two stable isotopes, 6Li and 7Li. If a sample is composed of 48.0% of the lighter…

A: Average mass of an element is defined as the atomic mass of the element calculated by multiplying…

Q: A sample of an iron alloy contains 90.2 g Fe, 2.15 g C, and 1.01 g Cr. Calculate the percent by mass…

A: Total mass of the alloy = mass of Fe + mass of C + mass of Cr = 90.2 + 2.15 + 1.01 = 93.36 g

Q: 3 FeS2   +  11 O2   →  Fe3O4   +  6 SO3 100 g of iron sulfide was reacted with excess oxygen,…

A: 3 FeS2   +  11 O2   →  Fe3O4   +  6 SO3 Atomic masses Fe=56; S=32, O=16 Molecular mass of…

Q: How many H atoms are there in (2.22x10^2) grams of NH3?

A: The answer to the following question is given as:

Q: late the mass in grams of a sample of NO2 that contains 1.000 x 1025 molecules.

A:

Q: Would it be possible to determine the percentage of oxygen in NaCIO3?

A: The given compound is = NaCIO3 The percent of oxygen in this compound is =?

Q: * Question Completion Status: Barium oxide was synthesized form the reaction of barium and oxygen in…

A: Barium reacts with oxygen to form barium oxide. The equation for the balanced chemical reaction is…

Q: 5.00 g of copper is reacted with 5.00 g of sulfur in a crucible and a compound composed of copper…

A: Mass percentage of substance is one of the ways to express composition of compounds. Mass percentage…

Q: What is the mass, in micro grams, of 8.9 x 10^15 atoms of cobalt?

A: The number of units present is the one mole of a substance is equal to 6.02214×1023 are termed as…

Q: An 8.00 gram sample of the hydrated salt, CoCl2 x XH2O was thermally decomposed into anhydrous…

A: Given: Mass of hydrated salt = 8.00 g. And the mass of anhydrous salt obtained = 4.370 g.

Q: Would it be possible to determine the percentage of oxygen in NaCIO3?

A: Mass percent of an element is the mass of element divided by its total mass. Write the expression to…

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…

Q: Consider a 5.430-g mixture of FeO and Fe3O4. You react this mixture with an excess of oxygen to form…

A: Given:Mass of mixture (FeO+Fe3O4) = 5.430 g.Mass of Fe2O3 = 5.779 g.Molar mass of FeO = 71.85…

Q: A sample of trifluoroacetic acid, C2HF3O2, contains 33.733.7 g of oxygen. Calculate the mass of the…

A: The molar mass of oxygen is 15.999 g/mol, so 33.7337g of oxygen converts to 2.10 moles of oxygen.…

Q: What would be the mass, in grams, of an NO2 sample in which 100 billion (1.00 X 10 11) moleculesare…

A: The number of molecules of NO2 sample is 1.00×1011.   The formula to calculate the number of…

Q: Cryolite, Na3AlF6(s), an ore used in the production of aluminum, can be synthesized using aluminum…

A: Given information: Mass of Al2O3 = 12.4 kg Mass of NaOH = 57.4 kg Mass of HF = 57.4 kg

Q: What mass of ammonia gas (NH3) contains 2.8*10^24 hydrogen atoms?

A:

Q: what is the mass of 1.08x10^22 molecules of SF6? pls, show how you got it.

A:

Q: Which element comprising Ma(OH)2 has the highest percentage by mass?

A: The compound given is Mg(OH)2. Assuming 1 mole of Mg(OH)2.

Q: Calculate the mass percentage of carbon in a mixture that contains 244 grams of potassium carbonate…

A: Molar mass of K2CO3 = 138 g/mol Molar mass of citric acid = 192 g/mol

Q: Iodine is made by the following reaction 2 NaIO3(aq) + 5 NaHSO3(aq) → 3 NaHSO4 (aq) + 2 Na2SO4 (aq)…

A: Given , Reaction : 2NaIO3(aq) +5 NaHSO3(aq) → 3NaHSO4(aq) + 2Na2SO4(aq) +H2O(I) +I2(aq)

Q: Fill in the blanks.

A: The balanced chemical equation for this reaction is: NH3 + Br2 + H2O → NH4Br + HOBrNH3 is…

Q: chemical formula

A:

Q: How many atoms of O are found in 1.00 x 10 2 g of K 2Cr 2O 7 ?

A: Number of atoms of Oxygen present in the given compound can be calculated as -

Q: the born- haber process is produces ammonia (NH3) and is responsible for the vast increase in…

A:

Q: Calculate the percentage composition for BF3. Mass percentage of boron %3D Mass percentage of…

A:

Q: A 67.2 gg sample of a gold and palladium alloy contains 3.55×1023 atomsatoms . A) What is the mass…

A:

Q: How many grams will 8.53 x 1023 molecules of C6H12O6 (180.16 g/mol) weigh?

A:

Q: Given the following reaction in the picture, what mass of hydrogen gas will be produced by the…

A: Given reaction: 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) We have to find the mass of hydrogen gas that…

Q: How many H atoms are there in (3.80x10^2) grams of H2O?

A: Number of moles = Mass/Molar mass Number of atoms in 1 mole = 6.0224 x 1023 Molar mass of water =…

Q: A given sample of xenon fluoride contains molecules of a single type XeFn, where n is some whole…

A:

Q: Elemental chlorine exists in nature as diatomic molecules of Cl2. Could the process you used to…

A: Chlorine is a halogen with atomic number 17. It has one unpaired electron in its outermost orbital.…

Q: A 2.25 g sample of titanium metal is burned in an oxygen atmosphere to produce 3.75 g of a titanium…

A: Given that the mass of Titanium is 2.25 g and the mass of oxide is 3.75 g of Titanium oxide. The…

Q: 1. Sphalerite is a zinc sulfide (ZnS) mineral and an important commercial source of zinc metal. The…

A: (1) Given that , mass of zinc sulfide = 5.00×103 g = 5000 g    Now, from following Reaction -  2ZnS…

Q: Starting with the following equation, Fe₃O₄(s) + CO(g) → Fe(l) + CO₂(g) calculate the mass in grams…

A: The reaction taking place is given as, => Fe3O4 (s) + CO (g) → Fe (l) + CO2 (g) Given: Mass of Fe…

Q: Dichlorodifluoromethane (CF2CI2) is an Ozone-depleting substance. It belongs to a class of compounds…

A: Atomic Weight of C = 12.01g/mol Atomic mass of Fluorine = 19.0g/mol Atomic mass of Chlorine =…

Q: The zinc inside the penny reacted with acetic acid (C

A: Chemical reactions are expreseed in equation form , these equations are called " chemical…

Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.