Answer:
B.) Trigonal planar
Explanation:
This molecule has 3 bonds and no lone pairs. The angles are all 120° and the bonds are within the same plane. These molecules have the molecular shape of trigonal planar.
Answer:
obtain something from (a specified source).
Explanation:
Answer : The measurements are both precise and accurate.
Explanation :
Accuracy : It is defined as the closeness of a measured value to a standard or known value.
For Example: If the mass of a substance is 50 kg and one person weighed 48 kg and another person weighed 55 kg. Then, the weight measured by first person is more accurate.
Precision : It is defined as the closeness of two or more measurements to each other.
For Example: If you weigh a given substance five times and you get 1.8 kg each time. Then the measurement is said to be precise.
Level of precision is determined by the maximum number of decimal places.
When the level of precision is very very less, the measurement can be considered as most precise and most accurate.
As we are given the standard value of the sample is 20.000 and the values measured by the balance are, 19.995, 20.005, 20.001.
Since these three values are in the range of +/- 0.005 from one another. So, we can say that the measurements are both precise and accurate.
Hence, the measurements are both precise and accurate.
Answer:
Option B. 0.285m NaCl
Explanation:
To find the molality, first let find the number of mole of NaCl in the solution. This is illustrated below
Molar Mass of NaCl = 58.5 g/mol
Mass of NaCl = 10g
Number of mole of NaCl = Mass of NaCl / molar Mass of NaCl
Number of mole of NaCl = 10/58.5 = 0.1709mol
Mass of water = 600g = 600/1000 = 0.6kg
Molality = mole of solute / mass of solvent
Molality = 0.1709mol/0.6kg
Molality = 0.285mol/Kg
