Multiple Choice
How many atoms are contained in 0.230 g of sodium, Na? The mass of one sodium atom is 23.99 amu.
4. Atoms and Elements
Subatomic Particles (Simplified)
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According to the table above, how many electrons are needed to have a combined mass of 1.0465 x 10-25 kg?
A
2.1028 x 1013
B
1.1500 x 105
C
8.8192 x 1025
D
3.2235 x 1022
Verified step by step guidance1
Identify the mass of a single electron. The mass of an electron is approximately 9.109 x 10^-31 kg.
Set up the equation to find the number of electrons needed to reach the given mass. Use the formula: \( \text{Number of electrons} = \frac{\text{Total mass}}{\text{Mass of one electron}} \).
Substitute the given total mass (1.0465 x 10^-25 kg) and the mass of one electron (9.109 x 10^-31 kg) into the equation.
Perform the division to calculate the number of electrons: \( \frac{1.0465 \times 10^{-25}}{9.109 \times 10^{-31}} \).
Analyze the result to determine which of the provided options matches the calculated number of electrons.
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