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Q: How many moles of hafnium contain 6.10 x 10^31 atoms of hafnium?

A: The no. of atoms in hafnium sample = 6.10 x 1031Avogadro’s number is defined as the number of atoms…

Q: Determine the mass, in grams, of 0.315 moles of S (1 mol of S has a mass of 32.07 g).

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Q: Determine the mass, in grams, of 0.720 moles of S (1 mol of S has a mass of 32.07 g).

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Q: help please answer in text form with proper workings and explanation for each and every part and…

A: Consider a general reaction:aA + bB → cC + dDThe lower-case alphabets are the coefficients of the…

Q: What is the mass in grams of 6.62 mol W

A: Given, moles of W= 6.62 mol Molar mass of W = 184g/mol (from periodic table)  Mass in grams = ?

Q: An element X occurs as three stable isotopes: X-21, X-22 and X-23. X-21 is 90.48% abundant and X-22…

A: Given : Element X exists as three stable isotopes. The three isotopes are: X-21 X-22 X-23

Q: While cleaning your attic, you found your old rock collection. If 83.58% of the rocks have a mass of…

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Q: How many atoms of neon are present in 1.30 moles of neon?

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Q: In what mass units are the average atomic mass and molecular mass expressed? What is the value of…

A: The average atomic mass and molecular mass is expressed in atomic mass unit (amu). It is defined as…

Q: Label Carbon's Periodic Table Symbol ANSWER BANK 6 Mass Number C Average Atomic Mass Atomic 12.011…

A: The periodic table has the number of elements and all these elements have a specific symbol showing…

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.95 L of He, how many atoms of…

A: It is given that :Density of helium in a balloon = 1.18 g/LVolume = 2.95 L

Q: What is the theoretical yield of SO3 produced by 2.14 g of S? Express your answer numerically in…

A: We have to calculate the theoretical yield of SO3.

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.99 L of He, how many atoms of…

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Q: What percentage of the CaCO3 mass is due to calcium?

A: By taking the atomic mass of calcium over the atomic mass of CaCO3 and multiplying it by 100 we can…

Q: C The radius of a nickel atom is 125 pm. How many nickel atoms would have to be laid side by side to…

A: We are given : radius of nickel atom (r) = 125 pm distance (d) = 1.11 mm number of nickel atoms (n)…

Q: What is the mass in grams of 68.3 mol Xe?

A: Mole can be defined as a standard unit for measuring large quantities of very small entities such as…

Q: How many atoms of Helium can a balloon that has a 25 cm diameter hold? The density of Helium is 1.18…

A: The mole (abbreviated mol) is the SI measure of quantity of a “chemical entity,” such as atoms,…

Q: Chapter 4 Review When the following equation is correctly balanced, what coefficient is in front of…

A: To balance a equation there must be equal number of atoms on both the side of the reaction .

Q: Determine the mass, in grams, of 0.710 moles of S (1 mol of S has a mass of 32.07 g).

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Q: Molar Mass of a Metal Data:  Mass of metal ribbon: 0.045 g Mass of HCL used: 7 mL The volume of the…

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Q: oxygen atoms

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Q: Stoichiometry Worksheet How many moles of sodium iodide (Nal) are produced when 43 grams of sodium…

A: Given reaction is, 2 Na (s) +I2(g)------> 2NaI(s) Mass of NaI= 43 g From Given reaction we can…

Q: Na +  H2O --->  NaOH +  H2 A mass of 6.2 moles of sodium reacts with an excess of water.  What mass…

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Q: Consider 8.63 x 1021 atoms of boron.   How many moles of boron does this represent?

A: 1 mol of atom  = Avogadro's number

Q: Given 88.0 grams of Boron, how many atoms of Boron (B) are present

A: To know, number of atoms, first we have to find out number of moles.

Q: 5.00 grams of a sample of hydrated PtCl4 are heated and lose 1.50 grams of water. How many moles of…

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Q: Mass, S s of 32.07 g).

A: Number of moles is calculated by dividing the given mass with molecular mass. Given molecular mass…

Q: How many Sn atoms are there in a 20.7 gram sample of Sn ?

A: Avogadro's  number gives the number of atoms, molecules or ions in one mole of the substance and it…

Q: The energy released when 1.08 mol of lead (II) bromide is formed from its elements is?

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Q: A sample contains 28.0 mg of Cu -64. How many atoms will remain in 40.0 days?

A: We have 28.0 mg of Cu-64 isotope. We need to calculate the remaining atoms after 40 days.This…

Q: Determine the mass, in grams, of 0.805 moles of S (1 mol of S has a mass of 32.07 g).

A: The general expression that shows relationship between moles and mass is as follows, Moles=MassMolar…

Q: Balance the equation below, which uses imaginary elements (they still follow the usual convention –…

A: We have to balance the equation below, which uses imaginary elements (they still follow the usual…

Q: Enter the precise mass numbers to the nearest 0.0001 mass unit. Compound A: C4H6O2 Compound B: C4H6S…

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Q: 5) ✓ PbS04 → PbSO3 + _ 02 6) _ Al + Fe2O3 → Fe + . Al203 7) SF6 → S + F2 8) _ C2H4 + 02 → CO2 + _ 9)…

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Q: How many atoms of Pt are present in 2.53 moles of Pt?

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Q: butane (C4H10) is combusted in the presence of oxygen.  carbon dioxide and water are produced. if…

A: Given - Weight of butane =150g Weight of carbon dioxide=?