All categories

3 years ago

PLEASE HELP FAST!! How much energy (in calories) is need to melt 3.0 moles of ice?

Chemistry

1 answer:

Viktor [21]3 years ago

4 0

Answer:

Energy

Explanation:

The heat required to change the phase of a substance is given by the equation:

Q= mL (Q= Heat required, m= mass, L= Latent Heat of Fusion/Evaporation/Anything else).

So, according to your values:

Q= 3.0 kg x 333 kJ/Kg

So, Q= 999 kJ

You might be interested in

There are three types of plate boundaries. Which choice is NOT a type of plate boundary?

prisoha [69]

There Are Three Types Of Plate Boundaries. Which choice is NOT a Type Of Plate Boundary?

Answer:C. Thrust

4 0

3 years ago

Read 2 more answers

In the wild, female and juvenile African elephants typically live in herds that vary in size, depending on the

uysha [10]

Herd behavior in elephants ensures that individuals are protected and the species is perpetuated.

<h3>What is her behavior?</h3>

It is a behavior that is characteristic of animals that form herds.

Herds generally refer to groups of animals that live or move together or both.

By protecting individual elephants that are weak or young from being preyed upon by lions and leopards, more members of the population survive.

When more members of the population survive, the species is perpetuated and the likelihood of going into extinction reduces.

More on herd behavior can be found here: brainly.com/question/15112922

#SPJ1

3 0

2 years ago

How many oranges are in 2.33 moles of oranges?

Vladimir [108]

Answer:

2.07 x 1020 tons

Explanation:

5 0

2 years ago

What is the mass percentage of oxygen in Ba3(PO4)2? Please help how do I go about figuring this out?

Mice21 [21]

Molecular Mass of Compound.

$\\ \sf\longmapsto Ba_3(PO_4)_2$

$\\ \sf\longmapsto 3(137u)+2(39u+4(16u))$

$\\ \sf\longmapsto 411u+2(39u+64u)$

$\\ \sf\longmapsto 411u+2(103u)$

$\\ \sf\longmapsto 411u+206u$

$\\ \sf\longmapsto 617u$

Molecular mass of O in compound=16(4)=64u

$\\ \sf\longmapsto Mass\%\:of\:O$

$\\ \sf\longmapsto \dfrac{64}{617}\times 100$

$\\ \sf\longmapsto \dfrac{6400}{617}$

$\\ \sf\longmapsto 10.3\%$

6 0

3 years ago

In part 2 of the experiment, you will be analyzing a sample of household bleach. A 0.0854 g sample of household bleach is comple

marysya [2.9K]

Answer:

The correct answer is option d.

Explanation:

$NaClO(aq)+2KI(s)+H_2O(l)\rightarrow NaCl(aq)+I_2(aq)+2KOH(aq)$ ..[1]

$I_2(aq)+2Na_2S_2O_3(aq)\rightarrow 2NaI(aq)+Na_2S_4O_6(aq)$ ..[2]

moles of sodium thiosulfate solution = n

Molarity of the sodium thiosulfate solution = 0.150 M

Volume of sodium thiosulfate solution used = 0.890 mL = 0.00089 L

$n=Molarity\times Volume (L)$

$n=0.150 M\times 0.00089 L=0.0001335 mol$

According to reaction [2], 2 moles of sodium thiosulfate reacts with 1 mol $I_2$ .

Then , 0.0001335 mol of sodium thiosulfate will reacts with:

$\frac{1}{2}\times 0.0001335 mol=0.00006675 mol$ of $I_2$

Moles of $I_2$ = 0.00006675 mol

According to reaction [1], 1 mol of $I_2$ is obatnied from 1 mol of NaClO.

Then 0.00006675 mol of $I_2$ will be obtained from:

$\frac{1}{1}\times 0.00006675 mol=0.00006675 mol$

Mass of 0.00006675 mol of NaClO=

0.00006675 mol × 74.44 g/mol = 0.00496887 g

Mass of sample = 0.0854 g

Percentage of NaClO in sample:

$\frac{0.00496887 g}{0.0854 g}\times 100=5.82\%$

4 0

3 years ago