Molar Challenges PART 1: WHAT IS THE IDENTITY OF THE ATOM? A scanning tunneling microscope (STM) allows scientists to manipulate individual atoms. Below is an image of the IBM logo created by manipulating atoms using an STM. Each dot in the picture is one atom of the same element. (c) Calculate the molar mass of the atoms in the letter I above and, using the periodic table, identify the element. PRACTICE PERFORMANCE TASK

Q: determine the  abundance in nature of each isotope in percent.

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Q: Calculate the number of atoms in 2.8 mol of Barium.

A: 1 mole of any substance has number of atoms or molecules equal to Avogadro's number in it.

Q: Determine the number of atoms in 39.0 grams of sodium, Na

A: Molar mass = mass of 1 mole 1 mole = 6.022 x 1023 entities

Q: Polymer poly ethyl cyanoacrylate, also known as "Super Glue", has the following composition: 57.59%…

A: Percentage composition of carbon = 57.59 % Atomic mass of carbon = 12.01 amu Molar ratio of carbon =…

Q: What is the total number of electrons in 5.335 moles of Sodium Chloride?

A: We need to calculate the total number of electrons in 5.335 moles of NaCl.We need to calculate the…

Q: How many atoms of vanadium are in 1.28 grams of vanadium ?

A: 1 mole of vanadium contains Avogadro’s number of atoms. The number of mole of 1.28 g of vanadium…

Q: Question 12 of 15 Determine the number of atoms of O in 90.3 moles of Cr3(PO4)2,

A: Given, moles of Cr3(PO4)2 = 90.3 moles Number of atoms = ?

Q: Write the chemical formula for each compound, and then calculate the number of atoms of oxygen in…

A: a) Given, 84.15g of boron oxide Chemical formula of boron oxide is = B2O3 Therefore, the number of…

Q: Determine the number of atoms in a 3.57g same of carbon

A: Since Carbon (C) is a mono atomic element hence number of atoms of C = moles X Avogadro's number…

Q: Write the formula and name between Iron (III) and workate and determine the type of the molecule…

A: A compound is formed by the electrostatic interaction between the cation and the anion. The cation…

Q: An atom consists of two isotopes, the first with an atomic mass of 15.8967 amu and the second with…

A: Atomic mass of first Isotope = 15.8967 amu Atomic mass of second Isotope = 16.8245 amu Average mass…

Q: If you have 7.20*10^26 platinum atoms, how many moles do you have?

A: Answer: This question is based on the relation between number of moles and Avogadro number which…

Q: The total number of oxygen atoms in the expression 3 Ca3 (PO4)2 is

A: We, have 3Ca3(PO4) 2  , We have to count total number of O atom in expression.

Q: atoms Calculate each of the following quantities in 0.200 mol of C6H140. You may want to reference…

A: Number of moles of C present in 1 mole of C6H14O = 6 mole Number of moles of C present in 0.200 mole…

Q: X represents a nonmetal atom with an atomic mass of 107.91 amu.  Calculate the number of grams of…

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Q: molar mass

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Q: Avogadro’s Number 1. 2.57 x 1011 atoms of silver equal how many moles of silver?

A: Given data: The number of atoms of silver is 2.57×1011. To calculate: The moles of silver.

Q: Popol learns in his biology class that human body is approximately 9.5% carbon. How many moles of…

A: Given 9.5% mass percentage. Using this wa can calculate mass of carbon and then moles.  Further…

Q: Calculate the formula mass of calcium carbonate.

A: The sum of atomic weights of the atoms present in the empirical formula of a compound is said to be…

Q: how many atoms of vanadium are in 1.28 grams of vanadium

A: Given: Mass of vanadium=1.28 g  The atomic mass of vanadium (gram atomic mass)=50.9415 g

Q: Use the average atomic mass to calculate the number of moles of the element present in 8.15g of…

A: Given , Mass of Neon= 8.15 g Average atomic mass of Neon= 20.18 g/mol

Q: How many Praseodymium atoms are present in 2.99 moles of Praseodymium ?

A: Given : 2.99 moles of Praseodymium ( Pr) Molecular weight of Pr = 140.91 grams

Q: How many atoms of vanadium are in 1.28 grams of vanadium ?

A: Given: Mass of Vanadium = 1.28 g Atomic mass of Vanadium = 51 g/mol To Calculate: Atoms of Vanadium…

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

A: Recall the formula of the unknown compound is C2Fx Given that the unknown compound contains 6.7 mol…

Q: A 0.632 mol sample of C6H8X2 has  mass of 90.07g identify X indicating the symbol and not the name…

A: The element can be identified by its molar mass. The molar mass of the elements X can be calculated…

Q: A carbon- hydrogen-nitrogen compound has a molar mass of 114.20 g/mol and it has the following…

A: Empirical formula of a compound may be defined as the formula which gives simplest whole number…

Q: You analyze a 42.6582 g sample of a compound comprised of 5.2279 g of carbon, 20.8914 g of oxygen…

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Q: Determine the number of atoms of O in 42.3 moles of Fe₂(SO₂),.

A: It is based on the concept of the mole concept. Here we are required to find the number of atoms of…

Q: What mass (in grams) of CH„O contains 3.984 x 1025 atoms?

A: The ratio of given mass of substance to molar mass of that substance is called as number of moles.…

Q: The total number of atoms in 2CaCI

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Q: Using the average atomic masses for each of the following elements, calculate the mass (in amu) of…

A: Average atomic masses of the following species is as follows - Na = 22.9898 amu Li = 6.941 amu Mg =…

Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.