Explanation:
Copper has an atomic number of 29, so it contains 29 protons and 29 electrons. ... The atomic weight of copper is 64; it has 29 protons and 35 neutrons.
Answer:
Jeweler B = more accurate
Jeweler A = more precise
Error:
0.008, 0
% error :
0.934% ; 0
Explanation:
Given that:
True mass of nugget = 0.856
Jeweler A: 0.863 g, 0.869 g, 0.859 g
Jeweler B: 0.875 g, 0.834 g, 0.858 g
Official measurement (A) = 0.863 + 0.869 + 0.859 = 2.591 / 3 = 0.864
Official measurement (B) = 0.875 + 0.834 + 0.858 = 2.567 / 3 = 0.8556
Accuracy = closeness of a measurement to the true value
Accuracy = true value - official measurement
Jeweler A's accuracy :
0.856 - 0.864 = - 0.008
Jeweler B's accuracy :
0.856 - 0.856 = 0.00
Therefore, Jeweler B's official measurement is more accurate as it is more close to the true value of the gold nugget.
However, Jeweler A's official measurement is more precise as each Jeweler A's measurement are closer to one another than Jeweler B's measurement which are more spread out.
Error:
Jeweler A's error :
0.864 - 0.856 = 0.008
% error =( error / true value) × 100
% error = (0.008/0.856) × 100% = 0.934%
Jeweler B's error :
0.856 - 0.856 = 0 ( since the official measurement as been rounded to match the decimal representation of the true value)
% error = 0%
<h3>
Answer:</h3>
54.756 g
<h3>
Explanation:</h3>
Assuming the equation for the reaction in question;
3NO₂(g) + H₂O(l) → 2HNO₃(aq) + NO(g)
We are given;
We are required to calculate the mass of HNO₃ produced
- We can calculate the mass of HNO₃ produced using the following simple steps;
<h3>Step 1: Calculate the moles of NO₂</h3>
Moles = Mass ÷ Molar mass
Molar mass of NO₂ = 46.01 g/mol
Therefore;
Moles of NO₂ = 60.0 g ÷ 46.01 g/mol
= 1.304 moles
<h3>Step 2: Calculate the moles of HNO₃ produced </h3>
From the equation, 3 moles of NO₂ reacted to produce 2 mole of HNO₃
Therefore, the mole ratio of NO₂ to HNO₃ is 3 : 2
Thus;
Moles of HNO₃ = Moles of NO₂ × 2/3
= 1.304 moles × 2/3
= 0.869 Moles
<h3>Step 3: Calculate the mass of HNO₃</h3>
Mass = Moles × Molar mass
Molar mass of HNO₃ = 63.01 g/mol
Therefore;
Mass = 0.869 moles × 63.01 g/mol
= 54.756 g
Thus, the mass of HNO₃ produced is 54.756 g
B
When frequency increases, as does the energy, but wavelength decreases. It also works vise versa; if wavelength were to increase, its frequency and energy will decrease.
Because the physical appearance change hope this helps
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