A substance is 77.5% Pb, 4.5% C, and 18.0% O. How many atoms of carbon are there for each atom  of lead?

Q: Lithium has two stable isotopes, 6Li and 7Li. If a sample is composed of 48.0% of the lighter…

A: Average mass of an element is defined as the atomic mass of the element calculated by multiplying…

Q: A sample of Ca3(PO4)2 contains 3.51 moles of calcium ions. How many moles of Ca3(PO4)2 are in that…

A: • Given,     Molecule = Ca3PO42 .    Number of moles of Ca+2 = 3.51 mole.    We know,    Ca3 PO42 →…

Q: The atomic weight of chromium is 52.00 . How many moles of Cr are there in a 5.44 g sample of…

A: Here given weight of sample of chromium  =  5.44 g                   atomic weight of chromium =  52…

Q: The atomic weight of bromine is 79.904, yet no atom of bromine weighs 79.904 amu. Why is this true?

A: Given : The atomic weight of bromine is 79.904, yet no atom of bromine weighs 79.904 amu.

Q: An organic compound has a molecular mass of 329.0 amu and contains 72.95% carbon by mass. How many…

A: The ratio of mass of particular element to the total mass of compound multiply by 100 is known as…

Q: How many atoms in total are there in one molecule of Mg(NO3)2?

A: In a molecular formula, symbols of all the constituting atoms are shown along with their numbers in…

Q: A compound is composed of element X and hydrogen. Analysis shows the compound to be 80% X by mass,…

A: Given data :- A compound is composed of element X and hydrogen. Analysis shows the compound to be…

Q: [% G)] [volume aitutea) W. 100 molecular weightsotute Molarityconcentrated Volume concentrated %3D

A: Let us discuss dilution of a solution and relate the formula.

Q: A compound has a molar mass of 155.5 g/mol. The empirical formula of the compound is C₂H₇. How many…

A:

Q: A) Suppose one molecule of Chlorophyll X contains 5 oxygen atoms. Chlorophyll X is 8.95% oxygen by…

A: Molecular mass of Chlorophyll X can be found out by using the mass percentage of Oxygen and number…

Q: A sample of C3H8C3H8 has 4.48×1024 H4.48×1024 H atoms. How many carbon atoms does the sample…

A:

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: A sample of hydrogen has a mass of 40.2 grams.  How many H atoms are there in the sample?   How…

A: Given that,mass of hydrogen = 40.2 gMolar mass of hydrogen = 2.016g/molmoles of hydrogen = mass of…

Q: A 3.87g sample of nitrous oxide (an anesthetic sometimes called laughing gas) contains 5.30x1022 N2O…

A: a) 1 molecule of N2O contains 2 nitrogen atoms, Hence, 5.30 ×1022 N N2O molecules will contain…

Q: 4. A chemist has a sample of propanol, C3H;OH, that contains 9.2 x 1024 molecules. What is the mass…

A:

Q: A sample of glucose, C6H12O6, contains 1.240×1021 carbon atoms. Part A: How many atoms of hydrogen…

A:

Q: Naturally occurring iron contains 5.82% 54Fe, 91.66 % 56Fe, 2.19% 57Fe, and 0.33% 58Fe.  The…

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

Q: Vitamin A has the molecular formula C20H300. How many carbon atoms are in 6.02 x 1023 molecules vit…

A: As molecular formula of vitamin A is C20H30O . Thus in one vitamin A molecule  has 20 carbon atoms .…

Q: How many grams of hydrogen are there in 28.13 g of a compound that contains 19.6% H and 80.4% C?

A: The mass of the compound is = 28.13 gThe percentage of hydrogen in the compound is = 19.6 %The…

Q: If you had 21.5 moles of silicon, how many atoms would you expect to have? And If you had 5.69 x…

A:

Q: A well-known reagent in analytical chemistry, dimethylglyoxime, has the empirical formula C2H4NO. If…

A:

Q: A sample of aluminum contains 2.91 x 1022 atoms of aluminum. What is the mass of this sample?…

A: Number of aluminum atoms = 2.91 x 1022 atomsmass of sample of aluminum = ?Note: Avogadro’s number:…

Q: Natural rubidium has the average mass of 85.4678 u and is composed of isotopes85Rb (mass = 84.9117…

A: Mass of the Rb = 86.913 amu. Given data: 85.4678 amu is average mass of the Rb Mass of 85Rb =…

Q: Aluminum bronze is a mixture of 92.0% copper (Cu) and 8.0% aluminum (Al) by mass. What percent of…

A: Given : Mass percent of Al = 8.0 % And mass percent of Cu = 92.0 % Assuming 100 g of mixture. Hence…

Q: Naturally occurring chlorine is 75.78% 35Cl (atomic mass 34.969 amu) and 24.22% 37Cl (atomic mass…

A: For 35Cl, % of naturally occuring chlorine in 35Cl = 75.78% Atomic mass of 35Cl = 34.969 amu So,Mass…

Q: How many atoms of hydrogen are there in 1 kg of methane (CH4)?

A:

Q: A sample of C3H8 has 8.00×10^24 H atoms. How many carbon atoms does the sample contain?  What is…

A: Given :- number of H atoms = 8.00 × 1024 atoms  To be calculated :-  No. of C atoms in sample…

Q: How many moles of arsenic is 2.345 x 1019 atoms? How many moles of carbon are in a 1.00 carat…

A:

Q: How many atoms of nitrogen are there in a sample of (4.80x10^2) grams of N2(g)?

A:

Q: How many moles would 1.00 x 103 molecules of methane ( 1. CH4) represent?

A: Avogadro number (NA) 1 mole of a substance contains 6.02×1023 molecules 1 mole of O2 contains…

Q: A sample of C3H8 has 6.32×1024 H atoms. How many carbon atoms does the sample contain? What is the…

A: In a molecule of C3H8, the mole ratio of carbon to hydrogen is 3:8. No of moles of a substance can…

Q: The molecular formula of hexakis(methylthio)benzene is C12H18S6. What is the percentage (by mass) of…

A: We have to calculate the % by mass of C in hexakis(methylthio)benzene .

Q: How many atoms of hydrogen are there in a sample of (9.60x10^2) grams of CH4(g)?

A: The number of moles of a substance is defined as the ratio of mass to molecular mass.  So, The…

Q: On another planet, the isotopes of titanium have the given natural abundances. Mass (u) Isotope 46T¡…

A: The atomic mass and abundance of the isotopes of Ti given are,

Q: Natural rubidium has the average mass of 85.4678 u and is composed of isotopes85 Rb (mass = 84.9117…

A: Mass of the Rb = 86.913 amu. Given data: 85.4678 amu is average mass of the Rb Mass of 85Rb =…

Q: The average mass of one atom of carbon is 2.00 x 10 –23 g. How many carbon atoms are present in a…

A: Given:Mass of one atom of carbon = 2.00 x 10 –23 g.Total mass of sample of carbon = 40.0 g.

Q: Thiophene is a compound composed only of carbon, hydrogen, and sulfur. It is 57.10% C, 4.79% H, and…

A:

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.