Question
Question: Number of atoms in 20g \[Ca\] is equal to number of molecules in: A. \[20\,g\,Mg\] B. \[8\,g\,C{...
Number of atoms in 20g Ca is equal to number of molecules in:
A. 20gMg
B. 8gCH4
C. 1.8gH2O
D. 1.7gNH3
Solution
A mole is characterized as the mass of the substance which consists of the equivalent amount of essential units. Example- atoms in 12 grams are equivalent to 12C. The basic units can be molecules, atoms or formula units dependent on the substance.
Complete answer:
A mole fraction shows the number of chemical elements. One mole of any substance is equivalent to the estimation of 6.023×1023 (Avogadro’s number). It very well may be utilized to quantify the products obtained from the chemical reaction. The unit is indicated by mol.
20 grams of calcium (20gCa) is 0.5mol
Option 1st: 20 grams of magnesium (20gMg ) is 0.83mol
Option 2nd: 8 grams of methane (8gCH4) is 0.5mol
Option 3rd: 1.8 grams of water (1.8gH2O) is 0.1mol
Option 4th: 1.7 grams of ammonia (1.7gNH3) is 0.1mol
The Number of atoms in 20 grams of calcium is equal to 8 grams of methane.
**Hence, the correct option is B.
Additional Information: **
The mole permits an extension between the impossible world of enormous numbers of tiny molecules and having the option to really weigh substances out and work with them. A mole of a substance contains 6.023×1023 particles of that substance. This is called Avogadro's number.
Note:
The connection among moles and mass is known as molar mass or the number of grams in a single mole of a substance. The molar mass for any element can be found under the symbol on the periodic table.