B.)<span>A doctor would opt for technetium-99m since its brief half-life allows for rapid measurements, while a geologist would select rubidium-87 due to its extended half-life, which provides a more substantial timeframe for dating ancient rocks.</span>
HNO₃ → H⁺ + NO₃⁻
v₁=35.0 mL
c₁=0.255 mmol/mL
n₁(NO₃⁻)=v₁c₁
Mg(NO₃)₂ → Mg²⁺ + 2NO₃⁻
v₂=45.0 mL
c₂=0.328 mmol/mL
n₂(NO₃⁻)=2c₂v₂
c₃={n₁+n₂}/(v₁+v₂)={c₁v₁ + 2c₂v₂}/(v₁+v₂)
c₃={35.0*0.255+2*0.328*45.0}/(35.0+45.0)≈0.481 mmol/mL
a. 0.481 m
The chalk production's efficiency is noted to be 82 %
To determine this efficiency, we utilize the formula,
% Efficiency
Finding the actual yield based on % efficiency and the theoretical yield:
82 %
Actual yield = 
Each box contains 145 grams of chalk
Total boxes = 
The chalk box company aims to produce 3000 boxes. However, with 82 % efficiency, they can only produce 2262 boxes, thus falling short of their target.
The density of human fat is
. The mass of the pure fat is 11.1 lbs.
First, convert the mass from pounds to grams as follows:
1 lb=453.592 g
Thus,

Density is defined as mass per unit volume, meaning volume can be calculated as:

By substituting the values,

Consequently, the volume gained by the individual will be
.
Answer:
(C) The average speed of molecules in ethane is the same as that of propanol.
Explanation:
In gas behavior, temperature is directly linked with speed. At a constant temperature, speed remains consistent. Also, we understand that ideal gases exhibit uniform behavior, irrespective of their type.