The mass of a dust particle is approximately \( 7.5 \times 10^{-10} \) kilograms and the mass of an electron is \( 9.1 \times 10^{-31} \) kilograms. How many electrons does it take to equal the mass of a dust particle? (1 point) \( 8.2 \times 10^{20} \) \( 6.8 \times 10^{-40} \) \( 1.2 \times 10^{21} \) \( 8.2 \times 10^{-90} \) \( 1.2 \times 10^{-21} \) \( 6.8 \times 10^{-41} \)

To find out how many electrons it takes to equal the mass of a dust particle, we need to divide the mass of the dust particle by the mass of an electron. Given: - Mass of a dust particle = \( 7.5 \times 10^{-10} \) kilograms - Mass of an electron = \( 9.1 \times 10^{-31} \) kilograms Let's calculate the number of electrons needed to equal the mass of a dust particle: \[ \text{Number of electrons} = \frac{\text{Mass of dust particle}}{\text{Mass of an electron}} \] \[ \text{Number of electrons} = \frac{7.5 \times 10^{-10}}{9.1 \times 10^{-31}} \] \[ \text{Number of electrons} = 8.2 \times 10^{20} \] Therefore, it takes \( 8.2 \times 10^{20} \) electrons to equal the mass of a dust particle.