select the correct answer. the compound diborane can be used as a rocket propellant. what is the percent…

select the correct answer. the compound diborane can be used as a rocket propellant. what is the percent composition of boron in diborane (b₂h₆)?\na. 22%\nb. 25%\nc. 39%\nd. 75%\ne. 78%

select the correct answer. the compound diborane can be used as a rocket propellant. what is the percent composition of boron in diborane (b₂h₆)?\na. 22%\nb. 25%\nc. 39%\nd. 75%\ne. 78%

Answer

Explanation:

Step1: Find atomic masses

From the periodic - table, the atomic mass of B (boron) is approximately 10.81 g/mol and the atomic mass of H (hydrogen) is approximately 1.008 g/mol.

Step2: Calculate molar mass of (B_2H_6)

The molar mass of (B_2H_6) is (M = 2\times10.81+6\times1.008). [ \begin{align*} M&=21.62 + 6.048\ &=27.668\text{ g/mol} \end{align*} ]

Step3: Calculate mass of boron in (B_2H_6)

The mass of boron in (B_2H_6) is (m_B=2\times10.81 = 21.62\text{ g/mol}).

Step4: Calculate percent composition of boron

The percent composition of boron is (\text{Percent composition of B}=\frac{m_B}{M}\times100%). [ \begin{align*} \text{Percent composition of B}&=\frac{21.62}{27.668}\times100%\ &\approx78% \end{align*} ]

Answer:

E. 78%