The empirical formula for this would be FeS
<span>They have the same mass and are both located in the nucleus of the atom.</span>
B. Sand.
Sand would definitely increase friction because of the roughness of it surface. When its surface comes with another rough surface it would tend to increase friction. All other options given tend to reduce friction one way or the other.
Atomic mass silicon = 28.085 u
1 mol Si ---------------- 28.085 g
? ------------------------ 245 g
245 x 1 / 28.085 => 8.72 mol
answer A
Explanation:
The use of microorganism in our day to day life is making medicine.
