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Bess [88]
2 years ago
15

Which of these models show atoms that have joined together? Select all that apply.

Chemistry
2 answers:
7nadin3 [17]2 years ago
7 0

Answer:

I think the 1st pic, the 2nd one, and the 3rd one.

Explanation:

Hope this helps.

Fantom [35]2 years ago
4 0

Answer: I think it's the second graph because they both look together and they chemically mixed together.

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garik1379 [7]

Answer:

11

Explanation:

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2 years ago
What volume of 1.00 m hcl in liters is needed to react completely (with nothing left over) with 0.750 l of 0.100 m na2co3?
kotykmax [81]
The balanced equation for the reaction is as follows
Na₂CO₃ + 2HCl --> 2NaCl + CO₂ + H₂O
stoichiometry of Na₂CO₃ to HCl is 1:2
number of Na₂CO₃ moles reacted = molarity x volume
number of Na₂CO₃ moles = 0.100 mol/L x 0.750 L = 0.0750 mol 
according to molar ratio of 1:2
1 mol of Na₂CO₃ reacts with 2 mol of HCl
then 0.0750 mol of Na₂CO₃ mol reacts with - 2 x 0.0750 = 0.150 mol 
molarity of given HCl solution is 1.00 mol/L
molarity is defined as the number of moles of solute in 1 L of solution 
there are 1.00 mol in 1 L of solution 
therefore there are 0.150 mol in - 0.150 mol / 1.00 mol/L = 0.150 L 
volume of HCl required is 0.150 L 
3 0
2 years ago
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andreev551 [17]
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