Answer:
mass (m) of the snow that the backpacker collected= 0.855 kg
Explanation:
Given that:
Q = 643 kJ = 643000 J
ΔHfusion = 6.02 kJ/mol = 6020 J/mol
number of mole of water H2O = 
c = 4.18 J/g⋅K
ΔT = 100 K
Since there is a phase change from solid to liquid; then :
ΔH = 
However without the given mass; we substitute 
for the number of moles; so:
Q = 
m = 855 g
m = 0.855 kg
mass (m) of the snow that the backpacker collected= 0.855 kg
Answer:
The height of the waves vary. The wave height is much larger for the air boat than for the mosquito.
Explanation:
Plato question
simple dimensional analysis:
8.2 grams * 1 mol / 22.99 grams * 6.02 x 10^23 atoms / mol = 2.1 x 10^23 atoms
Answer:
Option (b) "174 nm"
Explanation:
Energy of emitted photon is 7.13 eV.
We need to find the wavelength of the photon.
1 eV = 1.6 × 10⁻¹⁹ J
Energy of a photon is given by :
Where, 
is wavelength of the photon
Putting all the values,
So, the wavelength of the photon is 174 nm.
Answer:
A mixture
Explanation:
The substance whose magnetic properties is tested is mixture of many compounds, elements or molecules.
A mixture has the following properties:
- Their composition is indefinite
- Their constituents retain their identity
- Constituents react differently to changed conditions
- Their constituent can easily be separated by physical procedures.
Since a part of the mixture responds differently to magnetism, we can say, the other part is made up of a different set of compound.
