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3 years ago

A neutral atom of sodium has 11 protons. Use this information explain the total number of electrons that are in sodium

Chemistry

2 answers:

m_a_m_a [10]3 years ago

6 0

Answer:

Electrons and protons have opposite electric charge. They are present in the same number, but opposite electric charge. ( since the atom is neutral )

Explanation:

if we look at the periodic table we see, for the sodium atom (Na), that the atomic number (Z) is 11. The atomic number is the number of protons. Protons are positive.

Since this sodium atom is neutral, this means that there are the same number of electrons, which are negative. So also 11 electrons.

Electrons and protons have opposite electric charge.

Following the formula A = Z + N

Here is A = atomic mass, and is the sum of protons ( same as electrons ) + neutrons

As we can see on the periodic table the atomic mass of Sodium(Na) is 23

23 = 11 + N ⇔ N = 23 -11 = 12 neutrons

baherus [9]3 years ago

3 0

Answer: 11 Electrons

Explanation: This is because a neutral atom has the same number of protons and electrons.

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pashok25 [27]

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<h3>Explanation</h3>

The process:

$\text{KNO}_3\;(s) \to \text{KNO}_3\;(aq)$ .

How many moles of this process?

Relative atomic mass from a modern periodic table:

K: 39.098;
N: 14.007;
O: 15.999.

Molar mass of $\text{KNO}_3$ :

$M(\text{KNO}_3) = 39.098 + 14.007 + 3\times 15.999 = 101.102\;\text{g}\cdot\text{mol}^{-1}$ .

Number of moles of the process = Number of moles of $\text{KNO}_3$ dissolved:

$\displaystyle n = \frac{m}{M} = \frac{21.45}{101.102} = 0.212162\;\text{mol}$ .

What's the enthalpy change of this process?

$Q = C\cdot \Delta T = 0.505 \times (25.00 - 14.14) = 5.4843\;\text{kJ}$ for $0.212162\;\text{mol}$ . By convention, the enthalpy change $\Delta H$ measures the energy change for each mole of a process.

$\displaystyle \Delta H = \frac{Q}{n} = \frac{5.4843\text{kJ}}{0.212162\;\text{mol}} = 25.8\;\text{kJ}\cdot\text{mol}^{-1}$ .

The heat capacity is the least accurate number in these calculation. It comes with three significant figures. As a result, round the final result to three significant figures. However, make sure you keep at least one additional figure to minimize the risk of rounding errors during the calculation.

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Answer:

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