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Alinara [238K]
2 years ago
14

Na-23 has 12 neutrons. What is it’s atomic number?

Chemistry
2 answers:
erastovalidia [21]2 years ago
6 0

Answer:

11

Explanation:

The atomic number = number of protons. The mass number (23) = sum of number of neutrons and protons. Since you know the mass number is 23 and it has 12 neutrons, 23-12 gives you 11 protons, so its atomic number is 11.

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balu736 [363]2 years ago
3 0

Answer:

11 Protons

Explanation:

Na-23 shows the mass of the element as 23. Therefore subtract 12 neutrons from the mass to get # of protons which is = to atomic #.

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<span>Let's </span>assume that water vapor has ideal gas behavior. <span>
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PV = nRT<span>

</span><span>Where, P is the pressure of the gas (Pa), V is the volume of the gas (m³), n is the number of moles of gas (mol), R is the universal gas constant ( 8.314 J mol</span></span>⁻¹ K⁻¹) and T is temperature in Kelvin.<span>
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n = ?
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<span>
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<span>
Hence, the moles of water vapor at STP is 0.624 mol.

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<span>
Hence, number of atoms in water vapor = 0.624 mol x </span>6.022 × 10²³ mol⁻¹
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