Ask question

Ask question

All categories

lorasvet [3.4K]

3 years ago

7

How many calories of heat energy are required to melt 20 grams of ice at 0 °c?

1 answer:

Marta_Voda [28]3 years ago

3 0

The latent heat of fusion of ice is 80 calories per gram. This means that if we have 20 grams of ice to be melted from solid to liquid at the freezing point of 0 degrees C, we find the total heat requirement by:
Q = m(Lf) = (20 g)(80 cal/g) = 1600 calories
So the total heat requirement is 1600 calories.

You might be interested in

Bromine has two isotopes: 50.69% of Bromine has a mass number of 79 while 49.31% of Bromine has a mass number of 81. Calculate t

natka813 [3]

Not sure. How to answer this question.Look it up

8 0

3 years ago

Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 2.7 fm (femtometers) and the radius of t

Slav-nsk [51]

Explanation:

Let us assume that volumes is equal to spheres volume of nucleus.

fm = femto meter = $10^{-15}$

pm = pico meter = $10^{-12}$

Hence, calculate the volume as follows.

V = $\frac{4}{3} \times \pi \times r^{3}$

= $\frac{4}{3} \times 3.14 \times (2.7)^{3}$

= 82.4481 $fm^{3}$ (cubic femtometers)

or, = 82 $fm^{3}$

Now, we will calculate the volume of the atom as follows.

V = $\frac{4}{3} \times \pi \times r^{3}$

= $\frac{4}{3} \times 3.14 \times (70)^{3}$

= 1436758.4 $pm^{3}$ (cubic picometers)

thus, we can conclude that volume of the nucleus is 82 $fm^{3}$ and volume of the atom is 1436758.4 $pm^{3}$ .

7 0

3 years ago

How many grams of As2S3 are in 3.25 moles?

laiz [17]

Answer:

Explanation:

Molar mass of As2S3= {75(2) + 32(3)}

= 150 + 96 = 246g/mol

Amount = 3.25mole

And

Amount = mass/ molar mass

mass = amount × molar mass

Mass = 3.25 × 246

mass = 799.5g

6 0

3 years ago

WILL MARK BRAINIEST <br><br> Can someone please help me understand this?

Mila [183]

To convert from moles to grams you divide by the molar mass of the element. To convert from grams to moles you X by the molar mass element

5 0

3 years ago

How does nuclear fission produce energy answer.com?

scZoUnD [109]

Nuclear energy originates from splitting of uranium atoms a process called fission. This generates heat to produce steam.

Hope this helps❤️

7 0

3 years ago

Read 2 more answers