Question 10 Two years ago there were 7 grams of a radioactive substance. Now there are 6 grams. How much will remain 3 years from now? a) O4.96 grams b) 0 4.76 grams c) O4,56 grams d) 04.66 grams e) O 5.16 grams

Q: Question 11 D Mass of Zn 2.44 g Mass of Cu 0.063 g The mass of Zn and the mass of Cu in a coin are…

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Q: Hint Insert the missing coefficients to completely balance each chemical equation. equation 1: S…

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Q: Question 24 How many grams F in 584.8 g Br2F?

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Q: What is the atomic mass of oxygen-17 (16.9991 amu) at 0.038%

A: Using the formula We can easily get the answer

Q: What is the mass of 0.10 mole of methane (CH,)? A 0.10 gram 1.00 gram 1.60 grams D 16.00 grams

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Q: Question 3 Copper has two isotopes, 0°Cu and 0°Cu. If the atomic mass of copper is 63.5 g/mol, what…

A: Given: Atomic mass of copper = 63.5 g/mol Two isotopes of copper are, 63Cu and 65Cu

Q: What is the molecular mass of Sodium hydroxide given by the chemical formula “NaOH”. Atomic masses…

A: According to the question the chemical formula of sodium hydroxide is "NaOH"  Molecular mass is the…

Q: How many moles of phosphorus atoms do you have if you have 4.00 x 1022 atoms of phosphorus. (The…

A: Please find the attached images for the answer

Q: 2. If you want to produce 85 g of silicon, how many grams of magnesium will you need? How many grams…

A: The chemical reaction that takes place between sand and magnesium metal to produce elemental silicon…

Q: What is the maximum amount of chromium, Cr, that can be obtained from the reaction of 63.1 g of…

A: We have to calculate the mass of chromium formed of the above reaction

Q: How many sulfur atoms are there in 6.40 mol of sulfur? Express your answer using three significant…

A: In chemistry, 1 mole of any substance is equals to Avagadro's number (NA) i.e. 6.022…

Q: If the molecular formula for sugar is C6H12O6, what is the empirical formula?   Question 5 options:…

A: The empirical formula for a chemical compound represents the simplest integer ratio of atoms present…

Q: What is the atomic mass of oxygen-16 (15.9949 Amy) at 99.757%

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Q: What is the mass in grams of 2.583 mol of U?

A: Given the number of moles of uranium we are asked to determine the mass in grams.

Q: Name: ame: Jocelyn Heller You Try... Date: Period: 20. Given the following chemical equation 4 P+502…

A: The objective of the question is to calculate the molar mass of O2, the number of moles of P2O5…

Q: A sample of Al2(SO4)3 contains 11.2 g of oxygen, find the number of moles of Al2(SO4)3 (A) 0.0979…

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Q: A sample of Al2(SO4)3 contains 14.2 g of oxygen, find the number of moles of Al2(SO4)3 1.57 mol…

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Q: How many Kr atoms are there in a 12.7 gram sample of Kr ? atoms Submit Answer Retry Entire Group 8…

A: Given mass of sample of Kr = 12.7 g

Q: Why is the atomic weight of chlorine 35.4527 in stead of exactly 35

A: Answer:  Since chlorine exhibits two isotopes Cl35  and  Cl37 in 3:1 ratio Hence we will take…

Q: O2.00 mol of Al

A: Given that 54g of aluminium and asked how many moles are in 54g.

Q: QUESTION 13 1 mole of 6SCu atoms has a mass of about 63 grams. Explain why the number below Cu on…

A: The atoms with same atomic number but different mass number is known as isotopes.

Q: D Question 26 Suppose the reaction Cay(PO+3H,SO→3CaSO, + 2H3PO4 is carried out starting with 139 g…

A: 49.3g

Q: How many moles of scandium are in 3.55g scandium?

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Q: A mixture was found to contain 1.01 g SiO2, 0.730 g of cellulose, and 2.16 g of calcium carbonate.…

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Q: Fulminating silver is the historic name for compounds that contain silver and which explode…

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Q: What is the average mass of a single phosphorus atom in grams? mass: TOOLS x10

A: The atomic weight of Phosphorus atom (P) = 30.974 g/mol  1 mol means 6.022 × 1023 atoms  ? mol means…

Q: In the lab, I actually produced 23.5 g of methane when my theoretical yield was supposed to be 21.1g…

A: Given : Actual yield of product methane = 23.5 g And theoretical yield of product methane = 21.1 g

Q: A 3.88 gram sample of C6H2103 contains how many O atoms? Use 3 significant figures and scientific…

A: We have to find the number of oxygen atom in 3.88 gram of C6H21O3.

Q: Question attached

A: Given: Mass of calcium present in Calcium chloride is 20 g

Q: Acetylene (C₂H₂) gas and oxygen (O₂) gas react to form carbon dioxide (CO₂) gas and water (H₂O)…

A: Acetylene gas (C2H2) and Oxygen (O2) gas react to form carbon dioxide (CO2) gas and water (H2O)…

Q: An unknown compound has the following chemical formula: N03 where x stands for a whole number.…

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Q: QUESTION 11 What is the mass of 6.06E20 nitrogen atoms?

A: Molar mass is the mass of Avogadro's number of molecules.

Q: What is the average mass, in grams, of one Z a Mutple Choice O 1001 a 10 24. 66.39 amu 394 x 102 109…

A: No of atom is equal to mole × avagadro number

Q: How would the unknowns molar mass be affected if a small piece of the foil cap was lost before the…

A: It is very important to maintain the closed environment while dealing with volatile solvents.The…

Q: 30. A sample of a compound containing only S and Cl contains 2.72g S and 6.04g Cl. Another sample of…

A: given data = a sample compound only containing S and Cl S = 2.72 g, Cl = 6.04 g another sample of…

Q: QUESTION 5 What is the mass in grams of 4.14 moles of Al 20 3?

A: Given Moles of Al2O3 = 4.14 moles

Q: How many grams of potassium are present in 14.0 g of K2Cr2O7? O3.72 g 78.2 g O 1.86 g 07.0 g 0.716 g

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Q: grams of water

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Q: @LOT grams 2 Na + 2H₂O → 2 Na OH + H₂ en are How many grams of Hydrogen produced if 120gm of Na are…

A: Mass of Product: Sodium is an alkali metal. Sodium reacts with water and produces hydrogen gas and…

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.