Twelve dietary iron tablets were analyzed by the gravimetric procedure. the final mass of fe2o3 (fm 159.688) was 0.2774 ± 0.0018 g. find the average mass of fe per tablet. relative uncertainties in atomic masses are small compared with relative uncertainty in the mass of fe2o3. neglect uncertainties in atomic masses in this problem

How do we measure or think of speed in the united states?

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.