Answer:
1.78 D
Explanation:
v = 25 cm
u = 45 cm
use lens equation
1 / f = 1 / v - 1 / u
1 / f = 1 / 25 - 1 / 45
1 / f = (45 - 25) / 25 x 45
1 / f = 20 / 25 x 45
Power, P = 100 / f (m)
P = 2000 / 25 x 45 = 1.78 D
Thus, the power of lens is 1.78 D.
1 astronomical unit (1AU) or 150 000 000 km's (1.5 x<em>10^9</em> km). In SI units this is 10^12 meters
According to the Law of conservation of mass, the grams of oxygen formed are A) 0.7 g.
Explanation:
According to the Law of conservation of mass, the total mass of the products in a chemical reaction must be equal to the total mass of the reactants.
In this problem, the chemical reaction is:
where
is the mercuric oxide
Hg is the liquid mercury
O is the oxygen
We have the following data:
(mass of mercuric oxide)
(mass of liquid mercury)
Since the mass of the products must be equal to the mass of the reactant (the HgO), we can find the mass of the oxygen produced:
Learn more about the Law of conservation of mass here:
brainly.com/question/5017646
#LearnwithBrainly