Answer:
There is on reason why...
Explanation:
This is one reason astronomers and other scientists use scientific notation when working with very large or very small numbers. Scientific notation is a system for writing and working with numbers that makes it much easier to deal with numbers that are very small or very large.
There you go your awnser
Answer:
Mass of copper vaporized is 52,8g
Explanation:
The heat of vaporization (ΔHvap) is defined as the amount of energy you require to transform a quantity of liquid in gas. The formula is:
Q = ΔHvap×mass
Where Q is the amount of heat and mass is the mass of the compound.
If you required 254 kJ to vaporize a sample of copper which heat of vaporization is 4,81 kJ/g:
254kJ = 4,81 kJ/g × mass of copper
<em>52,8g = mass of copper</em>
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I hope it helps!
Answer: 26mL
Explanation:
You always need to see the meniscus of the liquid, (which is the curved figure in the liquid) in the cylinder, also, the question is telling you that write the correct number of significant figures, as the cylinder does not point at any decimal number, you cannot tell if it is on 26.1 or 26.9, you can be certain, only, that is 26 mL.
Answer:
0.257M HNO3
Explanation:
The reaction of HNO3 with Ba(OH)2 is:
2 HNO₃ + Ba(OH)₂ → 2 H₂O + Ba(NO₃)₂
That means 2 moles of HNO3 reacts with 1 mole of Ba(OH)2.
51,3mL of 0.250M Ba(OH)2 are:
0.0513L ₓ (0.250mol / L) = 0.0128moles
Moles of HNO3 are:
0.0128moles Ba(OH)2 ₓ (2 mol HNO3 / 1 mol Ba(OH)2) = 0.0257mol HNO3
As these moles are in 0.100L:
0.0257mol HNO3 / 0.100L = <em>0.257M HNO3</em>
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I hope it helps!
