We know that
Atomic mass of As = 74.95
Atomic mass of H = 1
so molar mass of [tex]AsH_{3}[/tex] = 77.95
[tex]moles=\frac{Mass}{Molarmass}[/tex]
given mass of [tex]AsH_{3}[/tex] = 15.0 g
therefore moles of [tex]AsH_{3}[/tex] in the given mass will be
[tex]moles=\frac{15}{77.95}=0.192[/tex]
Answer: the number of moles in 15g of [tex]AsH_{3}[/tex]=0.192 mole
The number of moles in 15 g of arsine ([tex]\rm AsH_3[/tex]) has been 0.192 moles.
Moles can be defined as the ratio of the mass of a substance with respect to its molecular mass.
Moles can be expressed as:
Moles = [tex]\rm \dfrac{mass}{molecular\;mass}[/tex]
The given compound has been Arsenic hydride. The molecular mass of arsenic hydride has been the sum of the atomic mass of 1 atom of Arsenic and 3 atoms of hydrogen.
The atomic mass of Arsenic = 74.946 g/mol
The atomic mass of hydrogen = 1 g/mol
The molecular mass of Arsine (Arsenic hydride) = Mass of As + 3 [tex]\times[/tex] mass of hydrogen
= 74.946 + 3 [tex]\times[/tex] 1 g/mol
= 74.946 + 3 g/mol
= 77.946 g/mol
The number of moles of arsine in 15 grams of the sample can be given as:
Moles of Arsine = [tex]\rm \dfrac{15}{77.946}[/tex]
Moles of Arsine = 0.192 moles.
The number of moles in 15 g of arsine ([tex]\rm AsH_3[/tex]) has been 0.192 moles.
For more information about the number of moles, refer to the link:
https://brainly.com/question/15209553
