1. A solid circular cone made of pure platinum (d = 21.45 g/cm3 ) has a diameter  of 2.75 cm and height of 3.00 inches.    a) How many moles of platinum are there in the cone?     b) How many electrons are there in the cone?

Q: How many atoms of He can a balloon hold that has a 21 cm diameter hold? The density of Helium is…

A: Radius, r=diameter2=212=10.5 cm volume of spherical baloon…

Q: Consider a 0.336 gram sample of H20 and determine the hydrogen's mass.

A: given :-  mass of sample of water = 0.336 g  To calculate :-  mass of H in the sample of water

Q: If the m. Wt. of BaSO4 = 233.42 g/mol %3D and m. Wt. of Na(SO4)2= 140.02 g/mol and wt of…

A:

Q: in the star wars series, the death star is a spherical space station and weapon with a diameter of…

A: The diameter of death star is 99 miles. The diameter of solid iron sphere is 6.23 times larger than…

Q: 6. A solid circular cone made of pure platinum (d = 21.45 g/cm³) has a diameter of 2.75 cm and a…

A: To calculate mole=mass/molar mass For Calculate electron  78electron present in 1 atom of platinum…

Q: How many atoms are contained in a titanium sphere having a diameter of 4.00 mm? The density of…

A: Given : density of titanium = 4.506 g/cm3  And diameter of sphere = 4.00 mm  Since 1 cm = 10 mm…

Q: What is the amount, in moles, of each elemental sample? 3.55 g Zn

A: The amount in moles of Zn are to be calculated. Given: Mass of Zn = 3.55 g The relation between mass…

Q: A 0.455 g sample of magnesium is allowed to burn in 2.315 g of oxygen gas. The sole product is…

A:

Q: S Ina 3.7-gram sample, there are (A) 1.1 x 10 atoms of gold (B) 3.2 x 1025 atoms of gold (C) 4.4 x…

A:

Q: a. 1.51 x 1015 atoms of Si to mol of Si

A: Given number of atoms can be easily calculated to moles by using avogadro number.

Q: 1b. The compound NaHCO, is commonly known as baking soda. A recipe requires 1.6g of baking soda,…

A:

Q: The figure (Figure 1) shows the reaction of element A (lavender spheres) with element B (tan…

A:

Q: How many silver atoms are contained in 1.75 moles of silver?

A: 1 mole of a substance is equal to the Avogadro number of atoms.  1 mole =6.022 x 1023 atoms.

Q: How many atoms of lead are required to cover a 37.0 cm by 55.0 cm area with a sheet of lead that is…

A: The required volume to cover =  37.0 cm×55.0 cm×0.142 cm…

Q: Name the following: CI, CIO, CIO, CIO ambined with other elements) I, (Br,I,N,CI,H,O,F.) NAMU

A: ate ----> ic  ite ----> ous  ide -----> hydro -ic  We have to name the following acid given…

Q: 29) What is the mass of 0.100 moles of Lithium? A) 0.649 B) 6.49 C) 12.98 D) 3.45 30) Which of the…

A: 29) The mass of 0.100 moles of Lithium can be calculated as - This is the correct answer but…

Q: A 6.700-g hydrate of sodium sulfate, Na2SO4-nH2O loses 2.896 g of its mass upon heating. The mass…

A: In this question, we will determine the value of n ( where n is the number of water molecules )…

Q: A pure silver sphere has a radius of 0.886 cm. How many silver atoms does it contain? (volume of a…

A: Calculate the volume of the silver sphere,      Volume of silver sphere = 43 π r3= 43 × 227 × (0.886…

Q: न 8। वडर nवोलल च. 89 ४\o-12. mol oft co, 9.18 X10-10 mol of mol of ऐष्वटमे०कक डि प.5 x ( o-e , क वीट…

A:

Q: 5. One carrot contains 0.75 mg of Vitamin A (C20H300) a) How many moles of Vitamin A is this? b) How…

A: Molecular formula of vitamin A = C20H30O Mass of vitamin A in one carrot = 0.75 mg = 0.75 × 10–3 g…

Q: When barium (Ba) reacts with sulfur (S) to form bariumsulfide (BaS), each Ba atom reacts with an S…

A: Since there are 1:1 ratio of atoms in the molecules, and it concludes that the same amount of each…

Q: 9. If a cabin et is made of 5.65 grams of Gold, how many atoms of gold are in the cabinet?

A:

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: How many grams of sulfur make up 3.01 mol of sulfur? [Use atomic mass: S, 32.06 amu]

A: The correct answer is given below

Q: How many Si atoms are there in a 63.4 gram sample of elemental Si? atoms

A: Given the mass of the Si sample = 63.4 g  We have to find the number of Si atoms.  We can proceed…

Q: Show your calculations clearly. Suppose you are provided with a 36.55 g sample of potassium…

A:

Q: titanium

A: Molar atomic mass of Ti = 47.87 gmol-1  Mass of Ti = 1.00kg = 1000 g  Moles of Ti = ( mass / molar…

Q: White sand is made of silica (silicon dioxide, or SiO2), which has a density of 2.20 g/cm3. How many…

A:

Q: A solid circular cone made of pure platinum (d = 21.45 g/cm3 ) has a diameter  of 2.75 cm and height…

A: Density of a substance is given by the ratio of mass to its volume. Density = MassVolume Volume of a…

Q: How many moles of electrons are needed to produce 1 mole of Ba (s)

A: Explanation to the correct answer is given below

Q: How many gold (Au) atoms are there in a 10. g sample of that is 50% Au by mass?  a. 6.2 x 1022 b.…

A:

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: ny atoms c

A:

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: How many V atoms are there in a 97.9 gram sample of V ? atoms

A: Mass of sample = 97.9 grams.  Number of atoms of V sample = ?

Q: Q11/ Calculate he equivalent weight of K2SO4, if you know the atomic weight of K=39, S=32, O=16.

A: Potassium sulphate = K2SO4 --> 2K+ + SO42- molecular weight = 174 (2x39 + 32 + 4x16)

Q: By x-ray diffraction it is possible to determine the geometric pattern in which atoms are arranged…

A: Given that : The edge length of the cube = 0.409 nm The density of silver = 10.5 g/cm3 The molar…

Q: A cylindrical piece of pure titanium (Ti, density=4.506 g/cm^3) has diameter d=1.15 cm and length…

A:

Q: 17. How many atoms of silver are present in a 75 gram pure sample? c. 1.34 x 10-20 d. 4.87 x 10-27…

A: Since you have posted multiple questions , as per guidelines we can answer one per session . If you…

Q: White sand is made of silica (silicon dioxide, or SiO2), which has a density of 2.20 g/cm3. How many…

A: The question is based on mole concept. We have been given diameter of the silicon atom. we have to…

Q: 2.43 g magnesium was completely burnt in oxygen to give magnesium oxide. 2 Mg(s) + O2(g) → 2 MgO(s)…

A: Answer: This question is based on the stoichiometric calculation from the chemical equation.

Q: The U. S. Environmental Protection Agency (EPA) sets limits on healthful levels of air pollutants.…

A: The U. S. Environmental Protection Agency (EPA) sets limits on healthful levels of air pollutants…

Q: How many titanium atoms are in a pure titanium bicycle frame with a mass of 1.34 kg ?

A: Given that mass of titanium bicycle frame = 1.34 kg = 1340 g Molar mass of titanium (Ti) = 47.867…

Q: The atomic weight of Aluminum element is 26.981 g/mol and atomic number is 13, the number of…

A:

Q: The U.S. Environmental Protection Agency (EPA) sets limits on healthful levels of air pollutants.…

A: Density is a physical quantity that can be determined with the help of the mass and volume of the…

Q: The ratio of the mass of O to the mass of N in N2O3 is 12:7. Another binary compound of nitrogen has…

A: Step 1        N2O3Mass of Oxygen in N2O3 = 16x3 =48gMass of Nitrogen in N2O3 = 14x2 = 28gMass of…

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.