In the following diagram, blue spheres represent the element A and yellow represent the element

Q: Tin, element 50 on the periodic table, has 10 stable isotopes. 117^Sn makes up 7.687% of naturally…

A: Using the formula moles of Sn117 is calculated as,

Q: Should the elemental symbol for lead be written as Pb or PB? What confusion could arise if the wrong…

A: Elemental symbol for lead is Pb and it should be Pb .

Q: What is an element composed of?

A: An element is a pure material made up of atoms with the same number of protons in their atomic…

Q: The element silver has both physical and chemical properties, some of which do not change when the…

A: When the size of sample changes , all the properties changes except the density of sample. Density…

Q: A mass of 145 g of a certain element is known to contain approximately 3.64 x1024 atoms. What is the…

A: Let the molecular weight of the element is M gm/mol.  Moles = weight/mol. wt.  Or, moles = 145/M  We…

Q: Using white and black circles to represent different kinds of atoms, make a drawing that accurately…

A: Given samples of matter,         A solid element, a liquid compound, and a heterogeneous mixture.

Q: 106. Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 2.7 fm,…

A:

Q: Magnesium oxide was formed when the metal burns in air.  (i)            If 1.25 g of magnesium…

A: Answer:- This question is answered by using the simple concept of calculation of mass ratio of the…

Q: Determine the mass in grams of 8.72 × 10²¹ atoms of barium. (The mass of one mole of barium is…

A: We have 8.72*1021 atoms of Ba. Mass of one mole of Ba is 137.33 g We have to calculate the mass of…

Q: Calculate the mass in grams of each elemental sample.(a) 1.32 * 1020 uranium atoms(b) 2.55 * 1022…

A: Mole is defined as the ratio of given mass and molar mass. The unit of mole is mol. It is utilized…

Q: 5.00 g of copper is reacted with 5.00 g of sulfur in a crucible and acompound composed of copper and…

A: The question is based on the concepts of reaction  Stoichiometry. we know the amount of product…

Q: 19.78 mL of bromine contains 6.022 x 1023 bromine molecules. How many bromine atoms are in 3.00 L of…

A: Given -> Volume (V1) = 19.78 ml = 0.01978 L (1L = 1000 ml) Number of bromine molecules in V1=…

Q: How much does 4.28 x 10 21 atoms of Nickel weigh?

A: We know that, one mole of any substance contains 6.022 × 1023 atoms. We can determine the weight by…

Q: Which of the following pairs of elements would you expect to be the most similar in both their…

A: In the periodic table, the elements are arranged according to their atomic number (electronic…

Q: 5. In a 3.7-gram sample, there are (A) 1.1 x 1022 atoms of gold (B) 3.2 x 1025 atoms of gold (C) 4.4…

A: Number of Mole-Ratio of given mass of substance to the molar mass of substance is called number of…

Q: Determine the mass in grams of 7.56 × 10²¹ atoms of carbon. (The mass of one mole of carbon is 12.01…

A:

Q: A sample of Aluminum foil contains 6.30 x 10^23 atoms. What is the mass of the foil

A: One mole of any substance contains 6.023 X 1023 units of that substance (atoms, ions or Molecules) .…

Q: How many grams would 4.15 x 1021 atoms of Pb weigh?

A: Answer

Q: How many grams does 1.44 x 1028 carbon atoms weigh?

A: To calculate the mass in grams for the atoms  First we have to convert the number of Atoms into…

Q: Solid potassium and oxygen gas react to produce solid potassium peroxide, K2O2. Assume the reaction…

A: 1) Write the balanced chemical equation for the given chemical reaction. 2) From the balanced…

Q: Chemistry focuses on representing the submicroscopic world of atoms. A billion atoms of gold-197…

A: 1 Billion atoms of Gold weigh  = 3.3 × 10-¹³ g

Q: Consider the element Ti (p=22, n=26) with a nuclear mass of 7.94869 x 10-23 g. (Given: mass of…

A:

Q: What is the mass of 1.6x10^21 argon atoms?

A: Molar mass of Argon is 39.95 g/mol i.e 1 mole of argon = 39.95 g of Argon Number of atoms of Argon…

Q: Which elements have molecules as their basic units?(a) helium (b) oxygen(c) iron (d) bromine

A: The elements which have  molecules as their basic units has to be given,

Q: What is a proton ? what is a chemical?

A: A proton is a subatomic particle which is present in the nucleus of an atom along with the neutrons.…

Q: What is the mass in grams of each elemental sample? (a) 6.64 mol W (c) 68.1 mol Xe (b) 0.581 mol Ba…

A: The molecular masses of the given elements are: a. Tungsten (W) - 183.84 g/mol b. Barium (Ba) -…

Q: If 7.736 g of a pure element contains 3.825×1022 atoms, what is the element?

A: In chemistry, the molar mass of an element is the mass of one mole of that substance, expressed in…

Q: A thermometer contains 2.5×1021 atoms of mercury. How many grams of mercury are in the thermometer?

A: To find the mass of mercury in the thermometer, you need to know the molar mass of mercury (Hg). The…

Q: Determine the mass in grams of 4.83 × 10²¹ atoms of barium

A: Given :- number of atoms of Ba = 4.83 × 1021 atoms  Mass of 1 mol Ba = 137.33 g  To calculate :-…

Q: Determine the mass in grams of 6.96 × 102¹ atoms of carbon. (The mass of one mole of carbon is 12.01…

A: Mole is defined as mass of substance divide by it's molar mass

Q: Should the elemental symbol for lead be written as Pb or PB? What confusion could arise if the wrong…

A: Atom is made up of nucleus (proton and neutrons) and electrons are revolving around it.

Q: 3) The mass of a proton is 1.67 x 10-27 kg. What is the mass of a proton in Gigagrams? A) 1.67 x…

A: 1 Kg = 103 g 1 g = 10-9 Gg 1 Kg = 10-6 Gg

Q: Should the elemental symbol for lead be written as Pb or PB? What confusion could arise if the wrong…

A: We know that, Lead is an element with the  atomic number 82 and its symbol is Pb . It is a metal and…

Q: The atomic masses of chlorine-35 (75.780%) and chlorine-37 (24.220%) are 34.969 amu and 36.966 amu,…

A: To calculate : average atomic mass of Cl

Q: Name various radioactive elements.

A: The various names of radioactive elements are named as in step 2.

Q: Determine the mass in grams of 7.21 × 10²¹ atoms of carbon. (The mass of one mole of carbon is 12.01…

A: Mole concept: The number of molecules or atoms present in the one mole of the substance is equal to…

Q: What are the properties of Fluorine (F) Chlorine (Cl) Bromine (Br) Iodine (I)

A: Halogens: These are the elements that are present in the 17th group of the periodic table. The given…

Q: A pure titanium bicycle frame contains 1.61 x 10^25 titanium atoms. What is its mass in kilograms?

A: 1 mole of any substance contain 6.022 × 1023 unit of that substance. that substance may be atoms,…

Q: À fictitious element only has two naturally occurring isotopes: X and Y. Isotope X has a mass of…

A: Average atomic mass can be calculated by the following formula. Average mass=∑mass of…

Q: Enter the symbols for the ions of sodium and phosphorus .

A: Sodium is an element which lies in group IA.  Sodium has a charge of +1.  Losing of one electron…

Q: the history of the discovery of hydrogen and what properties they observed to identify it

A: Position of hydrogen in periodic table:   Hydrogen is regarded as rogue / disputable element because…

Q: How many of the following elements are metals? Ca Al Sn S As Bi

A: The properties of metals are--- Metals are solid in room temperature (except mercury), they are…

Q: Rank the masses of the elements from lightest to heaviest. To rank items as equivalent, overlap…

A: Atomic masses of the elements: B : 11 u Cr: 52 u Li: 7 u

Q: A 67.2 g sample of a gold and palladium alloy contains 3.33*10^23 atoms.  a) What is the mass % of…

A: Given data,Mass of alloy=67.2gTotal number of atoms=3.33×1023atoms

Q: If you have 1.08 x 10^24 atoms of gold, how many grams of gold do you have?

A: 1 mole of a substance contains Avogadro's number (6.022×1023) of atoms.

Q: If a sample of an element has a mass of 80.2grams and contains 1. 78moles, what is the elements?

A:

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.