What is Avogadro’s umber?
What is gram atomic weight?
What is the difference between CO2 and 2CO2?
Name the following compounds PC3 and SO2.
In the smallest whole-number ratio must N and O atoms combine to make dinitrogen to tetroxide N2O4? What is the mole ratio of the elements I this compound?
How many moles of sodium atoms correspond to 1.56 x 1021 atoms of sodium?
What is the relationship between the formula weight of a substance and its molar mass?
How many grams of silver are in 0.263 mol of g?
How many atoms are 1.00 x 10-9 g of lead?
How many grams of iron are needed to combine with 25.6g of O to make Fe2O3?
What is the mass of 4 moles of aluminum atoms? ( Atomic mass of AI = 27u)
Calculate the mass of 6.022 x 1022 atoms of He.
Calculate the number of moles in 3.011 x 1022 molecules of carbon dioxide.
A samp0le of 45.8g of H2SO4 contains how many moles of H2O4?
What s the mass in grams of 5 moles of Fe?
How many moles of NaCI are present in 20 gm of the substance?
How many grams of O is present in 50 gm of CaCO3?
How many grams of CO2 are present in 0.1 mole CO2?
Describe the difference between the mass of a mole of oxygen atoms (O) and the mass of a mole of oxygen molecules (O2).
What do you understand by the term Formula unit?
Answers
1. The Avogadro constant = 6.022 × 10 23 atoms per mole.
2. the mass of one mole of an element equal in grams to the atomic weight. — called also gram-atom.
3. The substance with the chemical formula is called as carbon dioxide, whereas ( )is called as dicarbon dioxide. Carbon dioxide is composed of 1 atom of carbon and 1 atom of Oxygen, whereas dicarbon dioxide is composed of 2 carbon atoms and 2 oxygen atoms.
4. Pcl3 is named as phosphorus tri chloride And so2 is sulphur dioxide.
5. Therefore, n = 2 which is the mole ratio of elements in this compound. = → dinitrogen tetroxide.
6. The number of moles is equal to the number of particles of a substance in a given sample divided by the Avogadro's number. So, there are 0.26 x 10^-2 moles of sodium in 1.56 x 10^23 atom.
7.The formula mass (formula weight) of a molecule is the sum of the atomic weights of the atoms in its empirical formula. The molecular mass (molecular weight) of a molecule is its average mass as calculated by adding together the atomic weights of the atoms in the molecular formula.
8. The amount of moles is also defined as n = m/M, where
n - amount of moles,
m - the mass of the substance,
M - the Atomic Mass of the substance (Ag - 107.8682 g/mol), therefore
m = n×M = 0.263×107.8682 = 28,369 grams of Ag.
9. So 2.91 x 10^12 atoms.
10 . Molar mass of oxygen is 32 gram per mol and it will be used to convert its grams to moles. So, 59.6 grams of Iron are needed to combine with 25.6 grams of oxygen.
11. So, the mass of 4 moles of Aluminium atoms will be (4 x 27) g = 108 g.
12. Calculate the mass of 6.022 x1022 atoms of He. (c) 10 moles of sodium sulphite. 10 moles of sodium sulphite = 126 x 10 = 1260 u = 1260 gm.
13. no. of CO₂. And we know Avogadro Number = 6.02 × 10²³.
14.your answer is 45.8/98=0.47moles
15. the atomic masses of the Periodic Table can therefore show the molar mass of an element, in grams per mole of atoms. the atomic mass of iron Fe is 56 . the formula mass (molar mass of a compound) of Fe3 is 3⋅56 , which is 168 . the atomic mass of phosphorus P is 31
16. 0.342 mol
17. mole of CaCO3 = 50g/100g = 0.5 0.5 mole of CaCO3 contains 1.5 moles of oxygen atoms No. of oxygen atoms = 1.5 × 6.022×1023 = 9.033×1023 atoms Mass of Oxygen atoms = 1.5 × 16 = 24 g.
18. Molar mass of Carbon dioxide ( Co2 )
12 + 16*2 = 44 grams
So in the question it is given 0.1 moles
Therefore , Grams of Co2 in 0.1 moles is molar mass * moles given
44 *0.1= 4.4 grams (Ans)
19. mole oxygen atom is =16 gram
1 mole O2 =32 gram
difference= 32 - 16= 16 gram
20. A formula unit in chemistry is the empirical formula of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations. It is the lowest whole number ratio of ions represented in an ionic compound.
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