<span>Na</span>₂<span>CO</span>₃<span> + 2 HCl = 2 NaCl + CO</span>₂<span> + H</span>₂<span>O
106 g Na</span>₂CO₃ -------- 2 x 36.5 g HCl
<span> x g Na</span>₂CO₃ ---------- 750 g HCl
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Mass of Na</span>₂CO₃ = 750 x 106 / 2 x 36.5
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Mass ( Na</span>₂CO₃) = 79500 / 73
<span>
Mass = 1089.04 g
Number of moles = 1089.04 / 106 => 10.27 mols of Na</span>₂CO₃
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hope this helps!
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Answer: -
The approximate number of atoms in a bacterium is 10¹¹
Explanation: -
We are given the mass of a bacterium is 10⁻¹⁵ kg.
We are told that the mass of a hydrogen atom is 10⁻²⁷ kg.
Finally we learn that the average mass of an atom of the bacterium is ten times the mass of a hydrogen atom.
Mass of an atom of bacterium = 10 x mass of hydrogen atom
= 10 x 10⁻²⁷ kg.
= 10⁻²⁶ kg.
Thus the number of atoms in a bacterium =
=
= 10¹¹
Look at the instructions or listen to orders
You should never heat chemicals in a closed system (closed bottle or flask) because it might explode.
Answer & Explanation:
The molar mass of calcium chloride is 110.98 g/mol. We can use this information to solve this problem. We can set up our equation like this..
Multiply straight across on the top and straight across on the bottom.
Now divide.
So, there are 3.00 moles of calcium chloride contained in a 33 gram sample which is answer choice D.