Answer:
- The density of ethanol measures 0.80 g/ml.
Explanation:
The density of water is known to be 1 g/ml, indicating that 158 g of water occupies a volume of 158 ml.
d = m/v = 258/258 = 1 g/ml
This implies the volume will remain the same for ethanol.
hence, the density of ethanol = 127/158 = 0.80 g/ml
1. Stars originate within clouds of gas and dust referred to as nebulas. 2. These clouds are drawn together by gravitational forces. 3. Once sufficient heat and pressure accumulate, nuclear fusion commences, representing the birth of a star.
Response:
I think it should be 24 hours.
Details:
Greetings!
To determine the number of atoms present in 80.45 grams of magnesium, we require Avogadro's number and the weight of a single mole of magnesium.
Avogadro's number is 6.02 x 10^23 atoms, and the mass of one mole of magnesium is 24.31 grams.
1. First, divide by the weight of one mole of magnesium
80.45 / 24.31 ≈ 3.309 moles (rounded to appropriate significant figures)
2. Multiply the number of moles by Avogadro's number
3.309 x (6.02 x 10^23) ≈ 1.99 x 10^24 (rounded to appropriate significant figures)
Thus, in 80.45 grams of magnesium, there are approximately 1.99 x 10^24 atoms.
