References) The element thenium (Re) has two naturally occurring isotopes, 18 Re and 187RE, with an average atomic mass of 186.207 u. Rhenium is 62.60% 187 Re, and the atomic mass of 187 Re is 186.956 u. Calculate the atomic mass of 185 Re.

Q: Oxygen is the most abundant element in both Earth's crust and the human body. The atomic masses of…

A: When the product of atomic mass and abundance of each type of isotopes are summed up, we get the…

Q: Determine the number of atoms in 55.0 grams of sodium, Na. (The mass of one mole of sodium is 22.99…

A: Here given, the mass of one mole of sodium is 22.99 g. So, in 55 grams of sodium, there are…

Q: There has been increased evidence that human activities are causing changes in Earth's atmospheric…

A: The mass of oxygen used = 1.0 g. The molar mass of Oxygen = 16 g/mol.

Q: A 2.63 g2.63 g sample of a compound consisting of carbon, hydrogen, oxygen, nitrogen, and sulfur was…

A:

Q: What is the molar mass (in kg/mol) of carbon tetrachloride (CC14)? 6 17 C CL 35.45 12.01 2. 0.2535…

A: Here we are required to find the molar mass of carbon tetrachloride

Q: Which sample contains the greatest number of atoms? 54.7 g V 51.2 g Mn 203 g Bi

A: To find number of atom we have to calculate number of moles first. Moles= given mass/molar mass…

Q: 2. a) How is the mass of one mole of a substance determined? b) How do you determine the number of…

A: Answer of the question given below,

Q: Calculate the number of atoms in each of the following masses: a. 54.0 g of aluminum ans: 1.21 1024…

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Q: 10. When copper oxide reacts with hydrogen gas at high temperatures, copper metal and water vapor…

A:

Q: Which one of the following statements about the compound C3H4 is CORRECT? Oa. Five molecules of C3H4…

A:

Q: 1. What is the mass of 1.78×104 atoms of boron ? grams 2. How many boron atoms are there in 39.7…

A:

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

A:

Q: One mole of oxygen molecule (02) contains how many atoms of oxygen? a. 6.022 × 1023 O b. 1,6021 ×…

A: We have to tell the no. Of oxygen atom in 1 mole

Q: (c) 54.5% C, 9.2% H, and 36.3% O by mass

A: given :-  percentage composition of C = 54.5%  percentage composition of H = 9.2%  percentage…

Q: The mass of 5.20 moles of glucose, C6H12O6 is   1.56 × 10‑21 g   31.2 g…

A: Given, Moles of glucose (C6H12O6) = 5.20 mol Mass of glucose (C6H12O6) = ? Note; Molar mass of…

Q: Drag conversion units onto the boxes in the equation to make conversions. Some boxes can be left…

A:

Q: Calculate the mass, in grams, of 1.751.75 mol of neon, NeNe.   mass of NeNe:…

A: The mass of 1.75 mol of neon is calculated as,

Q: 3.01 x 1023 molecules of freon CCl,F,? 1.505 x 1024 molecules of sucrose C12H2201 1.806 x 1024…

A: One mole of any substance contains 6.023 x 1023 Molecules, ions , atoms.

Q: The number of O atoms in 1 mole of NO2 is A. 2 B. 1.204 x 1023 C. 6.02 x 1023 D. 1.204 x 1024

A: A mole of substance can be defined as a substance which contains exactly 6.022×1023 atoms,…

Q: Which of the following is equal to exactly 1 mole of atoms?     6.00 grams of carbon     31.93…

A: According to the mole concept , a mole is a measurement unit of any Substance in which particular…

Q: Assuming gasoline to be pure 2-methylhexane, C7 H16 (actually, it is a mixture of many substances),…

A: Molecules consumed per mile =  5.96 x 1023 molecules We need to find the mass of fuel.

Q: How many oxygen atoms are there in 3.15 g of Al2(S208)3 (MW AI2(S208)3 = 330.34 amu) O a. 3.01 X…

A: Given that : Molecular weight of Al2(S2O8)3 = 630.34 amu or g/mol Mass of Al2(S2O8)3 = 3.15 g Number…

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

A:

Q: Which of the following statements is/are TRUE regarding paracetamol, C8H9NO2? Select one or more:…

A:

Q: Two compounds have the same composition: 85.62% C and 14.38% H. a. Obtain the empirical formula…

A: Given:  Composition of C = 85.62% Composition of H = 14.38%

Q: hydrogen-2 hydrogen-3 phosphorous-32 p* = p* = p* = e = e = e = n° = n° = n° = uranium-238…

A:

Q: 28) Determine the mass of the following compound: 0.0146 mol KOH A) 56.11 g B) 0.819 g C) 8.19 g 29)…

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Q: How many oxygen atoms are there in 2.10 g of Al2(S208)3 (MW A12(S208)3 = 630.34 amu) %3D O a. 4.82 X…

A:

Q: a) What is the mass, in grams, of 5.000 moles of carbon atoms? b)What is the average mass, in…

A: Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…

Q: In a lab experiment, 7.2 g of Mg reacts with sulfur to form 16.7 g of magnesium sulfide. (a) Use…

A:

Q: Determine the mass, in grams, of 0.635 moles of I (1 mol of I has a mass of 126.90 g)

A: Given: Moles of I = 0.635 mol Molar mass of I = 126.90 g/mol

Q: What is the total number of atoms contained in 3.00 moles of cobalt?

A: Given :- number of moles of Co = 3.00 mol  To calculate :- number of atoms of Co

Q: How many oxygen atoms are there in 3.15 g of Al2(S208)3 (MW A12(S208)3 = 630.34 amu) O a. 2.41 X…

A: Given that,  Amount of Al2(S2O8)3 = 3.15 g Molar mass of Al2(S2O8)3 = 630.34 amu Moles of Al2(S2O8)3…

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: 4. A student had a sample of CaCl2 • nH20. He heated the sample until the mass did not change. From…

A: Since you have posted multiple questions, we are entitled to answer the first only. The experiment…

Q: 1. Determine the number of atoms in 0.475 g of palladium (Pd). atoms 2. Determine the mass of 139…

A: One mole of any element contains approximately 6.022 x 1023 atoms of that element. Therefore, to…

Q: 1. Find the necessary amount of Ag:CO, in grams in order to obtain 79.1 g of silver. A92CO, C: 12…

A: Silver carbonate decomposes into silver metal, carbon dioxide gas, and oxygen gas. The equation for…

Q: Determine the number of atoms in 27.0 grams of bromine, Br. (The mass of one mole of bromine is…

A: Given : mass of 1 mole of bromine i.e Br = 79.90 g And mass of Br = 27.0 g

Q: What is the empirical formula for a sample containing 79.842% carbon and 19.943% hydrogen? a.)…

A: In order to calculate the empirical formula of each compound , we first need to find the mass of…

Q: A mixture of 197.1 g of P and 203.6 g of O, reacts completely to form P.0, and P,010. Find the…

A: Using mole  concept  easily determine how much reactant used and how much product is formed .

Q: What does a chemical equation show? A. The reactants and products in a chemical reaction B. The…

A: Solution 7). A chemical reaction always shows reactants and products

Q: Dic orodifluoromethane (CF2C12) is an Ozone-depleting substance. It belongs to a class of compounds…

A: Given that, 10.0 g of CF2Cl2. Also, the atomic weights are  C = 12.01, F = 19.0, Cl = 35.45. The…

Q: the mass of Cu (63.35 g/mol) used to create Cu2S was 41.95 grams. what theoretical mass of Cu2S…

A: The balanced reaction of Cu to form CuS is,                       2 Cu + S  ---->  Cu2S Clearly,…

Q: What does TIC stand for in mass spec? Also explain what each point in the graph represents.

A: TIC means total ion Chromatogram.  the entire range  of masses  found at all points in the analysis.

Q: Find the mass of 1 molecule of NO in gram. а. 4.98 х10-23 O b. 30 О с. 15 O d. 4.98 x1023

A:

Q: Imagine that all our balances displayed mass in units of slugs instead of grams. Would we still…

A:

Q: A chemist will use a sample of 30 g of ethanol (CH3CH2OH) in an experiment. In one to two sentences,…

A: Given :-  mass of ethanol = 30 g  carbon      12.01 hydrogen   1.01 oxygen      16.00   To calculate…

Q: The number of oxygen atoms in 20.18 grams of Al(NO3); is: O 1.712 x 1023 O 0.09474 5.135 x 1023 O…

A: molecular mass of Al(NO3)3 = 213g no of atoms in 1 mole Al( NO3)3 = 6.023X1023 X 6 atoms no of moles…

Introduction to chemistry

Chemistry is a branch of science that deals with the analysis of material and the substances that comprise it. It also manages the properties of these substances and their reactions to form new substances. It is basically centered on particles and atoms that make up components and mixtures. These chemical species will in general connect using bonds.