Part B Magnesium makes up 2.10 % by mass of the Earth's crust. How many grams of magnesium are present if a sample of the Earth's crust has a mass of 1.35 g ?

Q: The use of freons is being phased out because of the damage these compounds do to the stratospheric…

A: a.

Q: A sample of an iron alloy contains 89.4 g Fe, 2.50 g C, and 1.47 g Cr. Calculate the percent by mass…

A: Given :-  Mass of Fe = 89.4 g  Mass of C = 2.50 g  Mass of Cr = 1.47 g  To calculate :-  Percent by…

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: Mercury occurs as sulfide ore called cinnabar, HgS. How many grams of mercury are contained in 578…

A: Since, Moles is the ratio of mass to the molar mass of that atom or molecules. Thus,

Q: The refining of aluminum from bauxite ore (which contains 50.% Al2O3 by mass) proceeds by the…

A:

Q: a. How many ATOMS of boron are present in 7.41 grams of boron trichloride? 3.805x10^21 atoms of…

A: Molecule given = BCl3 1 molecule of BCl3 = 1×6.022 ×1023 Molar mass of BCl3 = 117.3 g/mol 117.3 g of…

Q: .Pure molten iron and carbon monoxide are produced in a blast furnace by the reaction of iron(III)…

A: Given mass of iron(III) oxide = 1.58 kg

Q: We have 425 cm3 of a material. How many g is it? The material has density of 0.345 g/cm O 68.0 g O…

A: We have to find mass ,volume and density  is given in the question  Volume of the material = 425 cm3…

Q: The molecular weight of cholesterol is 386.65 g/mol. What is the mass of one molecule of…

A:

Q: Assume that the molar mass of A is 82.93 grams per mole and the molar mass of E is 24.61 grams per…

A: Atoms are the smallest unit of the matter, anything which occupies space and has mass is known as…

Q: 60. Lithium and bromine combine to form lithium bromide, as shown here. If 30 moles of Li react with…

A: 2Li(s) + Br2(l) ----> 2LiBr(s) ............(equation-1) Moles of Li = 30 mole

Q: A sample of nickel silver contains 18.0% nickel by mass. What mass of nickel silver must be melted…

A: Given: Sample of Nickel Silver contains: 18% Nickel by mass.

Q: The hydrated salt, MY3.XH2O, was heated strongly in a crucible to remove all the water molecules of…

A: From the given information , we have,         Mass of empty cruicible and cover, m1 = 28.86 g…

Q: A type of steel used for bicycle frames contain 5g of manganese in every 400 g of steel. How much…

A: Given: Mass of manganese in 400 g of steel = 5 g And total mass of steel in bicycle = 2200 g

Q: Suppose you analyze a 35.4 g sample of bleach and determine that there are 2.26 g of sodium…

A:

Q: Sand is mainly silicon dioxide. When sand is heated with an excess of coke (carbon), pure silicon…

A: Given : Silicon dioxide reacts with coke i.e carbon to produce silicon and carbon monoxide. Hence…

Q: A 15-g sample of lithium is reacted with 15 g of fluorine to form lithium fluoride: 2Li + F2 →…

A: First convert mass into mole by diving molar mass respectively Then Calculate limiting reagent by…

Q: Oxygen makes up 46.7% by mass of the earth's crust. How many grams of oxygen are present if a sample…

A: Given that, 46.7% by mass of the crust of earth is made up of Oxygen. It implies that every 100 g of…

Q: A 20.0-gram sample of impure NaClO3 produces 4.72 L of oxygen (STP). What is the percentage purity…

A: Percentage purity can be calculated by back calculation of the amount of O2 should be produced.

Q: Oxygen makes up 46.7% by mass of the earth's crust. How any grams of oxygen are present if a sample…

A:

Q: how many grams of Cu(NO3)2 can be made from 25 grams of copper

A: The reaction involves,

Q: certain alloy with a density of 11.5 g/cm3 contains 55% iron by mass. a) How many pg of iron would…

A: Density is defined as the mass per unit volume. It is represented by rho . Its relation is as…

Q: Iron (III) perchlorate was found in a solid form. How many kg of the solid would be needed to have…

A: Molar mass of Iron (III) perchlorate is calculated as follows,

Q: %3D The mass of 2.21 x 1040 atoms of iron (molar mass = 55.845 g/mol) is O 2.78 x 104 g. 2.05 x 102g…

A:

Q: Lead is found in Earth’s crust as several different lead ores. Suppose a certain rock is 38.0% PbS…

A:

Q: The relative mass of propylene (C₃H₆) is 42.1 g/mol. How many carbon atoms does a polypropylene…

A: Given data is: Molar mass of polypropylene = 42.1 kg/mol 42.1kg1 mol×1000g1kg=42100g/mol formula of…

Q: A 10.5 g sample of lithium is reacted with 18.5 g of fluorine to form lithium fluoride: Li + F2 →…

A: Given, A 10.5 g sample of lithium is reacted with 18.5 g of fluorine to form lithium fluoride:Li +…

Q: If the magnesium strip weighed 0.51 g, what would the theoretical yield (in grams) of H2 gas be?…

A: Given :- mass of Mg strip = 0.51 g  To calculate :- theoretical yield of H2 gas (in grams)

Q: You have 30 g CH4 that you burn in oxygen. How many grams of water can you make?

A: We will use stoichiometry of the reaction to get the answer.

Q: 4. ocean water contains 3.4% sodium chloride by mass. How much salt can be obtained from 346.8 g of…

A: Given: Percentage of NaCl= 3.4% Mass of sea water= 346.8g To find: The mass of salt

Q: A bottle of a tile cleanser contains 135g og HCl and 775g of water. What is the percent by mass og…

A:

Q: The formula for boron trichloride is BCl3. A. How many molecules are in 9.31 grams of boron…

A: Molecular formula of Boron trichloride is BCl3. It has three Chlorine atom and one boron atom. Molar…

Q: The most common oxide of vanadium, V2O5, is used as a catalyst in manufacturing sulfuric acid H2…

A:

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.