Silane is a gas that is used to prepare extremely pure silicon for use in semiconductors, such as computer chips. a sample of silane has a mass of 15.0 g and occupies a volume of 4.81 l at a pressure of 2.35 atm and a temperature of 22 ºc. what is the molar mass of silane?

Molar mass of silane = 32.15 g/mol

Explanation:

Given:  

Pressure = 2.35 atm

Temperature = 22 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,  

T₁ = (22 + 273.15) K = 295.15 K  

Volume = 42.9 L

Using ideal gas equation as:

PV=nRT

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 0.0821 L.atm/K.mol

Applying the equation as:

2.35 atm × 4.81 L = n × 0.0821 L.atm/K.mol × 295.15 K  

⇒n = 0.4665 moles

Given, Mass = 15.0 g

The formula for the calculation of moles is shown below:

Thus,

Molar mass of silane = 32.15 g/mol

h let me think

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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