How many grams of calcium will have the same number of atoms as 10 grams of Neon?
2. How many atoms of hydrogen and oxygen are present in 147 g of Sulphuric acid?
3. Which have more molecules? 20 g of Ammonia gas or 30 g of oxygen gas?
4. What mass of Calcium carbonate will react with 73 of Hydrochloric acid to produce 18 g of water and 44 g of carbon dioxide and 111 gram of CaCl2 if the law of conservation of mass is true?
5. How many atoms of carbon are present in 0.5 moles of sodium bicarbonate?
Answers
Explanation:
1. calcium into moles. We have been given that the atomic mass of calcium is 40 u, so 1 mole of calcium is 40 grams. Now, 110 mole of calcium will have the same number of atoms as 110 mole of neon.
2. 1 mole of H2SO4=98 GRAMS
1 mole of H2SO4 =NA (AVAGADRO NO) MOLECULES
1 MOLECULE OF H2SO4 = 7 ATOMS
THEREFORE, 1 mole of H2SO4 = 7×NA ATOMS
THAT MEANS , 98 GRAMS OF H2SO4 =7×NA ATOMS
SO, 1 GRAM OF H2SO4 = {(7×NA)÷98}ATOMS
THEREFORE ,147 grams of H2SO4 = {(7×NA)÷98}×147ATOMS=105NA ATOMS
OR EASY WAY
147GRAMS OF H2SO4 =1/2 MOLES OF H2SO4
98 GRAMS OF H2SO4 = 7×NA ATOMS
THERE FOR HALF MOLES OF H2SO4 =3.5 NA ATOMS.
HOPE THAT HELPS!
Answer:
1. calcium into moles. We have been given that the atomic mass of calcium is 40 u, so 1 mole of calcium is 40 grams. Now, 110 mole of calcium will have the same number of atoms as 110 mole of neon.
2. 1 mole of H2SO4=98 GRAMS
1 mole of H2SO4 =NA (AVAGADRO NO) MOLECULES
1 MOLECULE OF H2SO4 = 7 ATOMS
THEREFORE, 1 mole of H2SO4 = 7×NA ATOMS
THAT MEANS , 98 GRAMS OF H2SO4 =7×NA ATOMS
SO, 1 GRAM OF H2SO4 = {(7×NA)÷98}ATOMS
THEREFORE ,147 grams of H2SO4 = {(7×NA)÷98}×147ATOMS=105NA ATOMS
OR EASY WAY
147GRAMS OF H2SO4 =1/2 MOLES OF H2SO4
98 GRAMS OF H2SO4 = 7×NA ATOMS
THERE FOR HALF MOLES OF H2SO4 =3.5 NA ATOMS.
HOPE THAT HELPS!
Explanation: