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avanturin [10]
3 years ago
14

If an element has an atomic number of 12 how many protons does each atom have?

Chemistry
1 answer:
DanielleElmas [232]3 years ago
3 0
12
The atomic number is equal to the number of protons in the nucleus
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A student prepares a solution of sodium chloride by dissolving 116.9 g of NaCl into enough water to make 1.00 L of solution. How
sertanlavr [38]

Answer: The molarity of the solution is 2.00 M

Explanation:

Molarity is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n}{V_s}

where,

n = moles of solute

V_s = volume of solution in L = 1.00 L

moles of solute =\frac{\text {given mass}}{\text {molar mass}}=\frac{116.9g}{58.5g/mol}=2.00moles

Molarity=\frac{2.00mol}{1.00L}=2.00M

Thus the molarity of the solution is 2.00 M

8 0
4 years ago
What are the molarity and osmolarity of a 1-liter solution that contains half a mole of calcium chloride? How many molecules of
givi [52]

Answer:

Molarity = 0.5 M

Osmolarity = 0.5 x 2 = 1 Osmpl.

Molecules of Cl2 = 6.02 x 10^{23} / 4= 1.505 x 10^{23} no. of molecules

Explanation:

If we add half mole in 1L volume than molarity will obviously be 0.5 M.

The osmolarity is molarity multiplies by number of dissociates of solute that for CaCl2 are 2. So, 2 x 0.5 = 1

Half will be molecules of Ca and half will be of Cl2 for 0.5M.

6 0
4 years ago
Container has 28% hydrogen gas and 72%of helium gas at 760 torr pressure. Calculate the partial pressure of helium gas ?
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8 0
3 years ago
How much HCI exists in 275 mL of 0.83 M<br> solution of HCI?<br> Answer in units of mol.
zubka84 [21]

Answer:

0.22825mol HCl

Explanation:

M=\frac{moles}{liters} \\

0.83M HCl = \frac{x(mol)}{0.275L}

1. Cross multiply!

\frac{0.83M}{1} =\frac{x}{0.275L}

x = 0.22825 mol HCl

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3 years ago
Sunny makes a poster showing the levels of
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Answer:

3rd and 5th!

Explanation:

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3 years ago
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