The only answer we can choose
<span>B.
energy needed to break chemical bonds.</span>
Explanation:
To solve this problem, we need to understand the concept of precision and accuracy.
Through this understanding we apply to solve this problem.
- Precision is the ability to reproduce the same set of values in an experiment.
- Accuracy is the nearness or closeness of the measured value to the true value.
For example; if the true value is 28.0mm and the following readings were made:
A = 24.0mm, 24.0mm, 24.3mm, 23.9mm This is a precise measurement but not accurate.
B = 27.9mm, 28.0mm, 28.1mm: This is an accurate measurement because it is close to the true value.
Given: Molecular formula of the compound is C₈H₁₁O₂
Since C₈H₁₁O₂ molecule contains two atoms of oxygen which is equal to one mole.
∵ In 1 mole of C₈H₁₁O₂, oxygen has = 1.0 mole
∴ In 3.7 moles of C₈H₁₁O₂, oxygen has = (1.0 mole) × (3.7 moles) ÷ (1 mole)
= 3.7 moles
Hence, oxygen has 3.7 moles in 3.7 moles of C₈H₁₁O₂
Part 1: Potassium, and Rubidium.Part 2: Calcium has 20 protons and 20 electrons because the atomic number for calcium is 20 and that determines how many protons there are and in an atom, the number of protons is the same number of electrons. Calcium has about 20 neutrons. I got the number of Neutrons by subtracting the mass number(40.078) and the atomic number(20), I got 20.078. Round to the nearest whole number because you cannot have half or partial neutron. So, Calcium has 20 protons, 20 electrons, and 20 neutrons,
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