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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 CaCa is equal to number of molecules in:
A. 20gMg20\,g\,Mg
B. 8gCH48\,g\,C{{H}_{4}}
C. 1.8gH2O1.8\,g\,{{H}_{2}}O
D. 1.7gNH31.7\,g\,N{{H}_{3}}

Explanation

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 6.023×10236.023\times 10^{23} (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 (20gCa20\,g\,Ca) is 0.5mol0.5mol
Option 1st: 20 grams of magnesium (20gMg20\,g\,Mg ) is 0.83mol0.83\,mol
Option 2nd: 8 grams of methane (8gCH48\,g\,C{{H}_{4}}) is 0.5mol0.5\,mol
Option 3rd: 1.8 grams of water (1.8gH2O1.8\,g\,{{H}_{2}}O) is 0.1mol0.1\,mol
Option 4th: 1.7 grams of ammonia (1.7gNH31.7\,g\,N{{H}_{3}}) is 0.1mol0.1\,mol
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 6.023×10236.023\times 10^{23} 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.