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3 years ago

How much energy is required to melt 2kg of ice at 0°C?

Chemistry

2 answers:

sertanlavr [38]3 years ago

8 0

Answer: Therefore, to melt 2kg of ice 835. 48kJ of heat is required.

Explanation:

I hope this helps!

Ann [662]3 years ago

7 0

Answer 0 °C + Heat required to convert 2 kg of water at 0 °C to 2 kg of water at 20 °C. Therefore, to melt 2 kg of ice 835.48 KJ of heat is required.

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A certain compound has the percent composition (by mass) 85.63% C and 14.37% H. The molar mass of the compound is 42.0 g/mol. Ca

AlekseyPX

Answer:

The molecular formula is C3H6

Explanation:

Step 1: Data given

Suppose the compound has a mass of 100 grams

The compound contains:

85.63 % C = 85.63 grams C

14.37 % H = 14.37 grams H

Molar mass C = 12.01 g/mol

Molar mass H = 1.01 g/mol

Step 2: Calculate moles

Moles = grams / molar mass

Moles C = 85.63 grams / 12.01 g/mol

Moles C = 7.130 moles

Moles H = 14.37 grams / 1.01 g/mol

Moles H = 14.2 moles

Step 3: Calculate the mol ratio

We divide by the smallest amount of moles

C: 7.130 moles / 7.130 moles = 1

H = 14.2 moles / 7.130 moles = 2

The empirical formula is CH2

The molar mass of CH2 = 14 g/mol

Step 4: Calculate molecular formula

We have to multiply the empirical formula by n

n = 42 / 14 = 3

n*(CH2) = C3H6

The molecular formula is C3H6

8 0

3 years ago

Biologists study the structural adaptations of organisms, which are

strojnjashka [21]

In biology, an adaptation, also called an adaptive trait, is a trait with a current functional role in the life history of an organism that is maintained and evolved by means of natural selection.

6 0

4 years ago

A chemist needs 500.0 mL of a 1.500 M perchloric acid solution. The stockroom provides the chemist with

Lynna [10]

Answer:- 47.62 mL

Solution:- It is a dilution problem where we are asked to calculate the volume of 15.75 M perchloric acid solution required to make 500.0 mL of 1.500 M solution.

For solving this type of problems we use the dilution equation:

$M_1V_1=M_2V_2$

Where, $M_1$ is the concentration of the concentrated solution and $V_1$ is it's volume.

$M_2$ is the concentration of the diluted solution and $V_2$ is it's volume. Let's plug in the values in the equation and solve it for $V_1$ .

$15.75M(V_1)=1.500M(500.0mL)$

On rearranging this for $V_1$ :

$V_1=\frac{1.500M(500.0mL)}{15.75M}$

$V_1=47.60mL$

So, 47.62 mL of 15.75 M perchloric acid are required to make 500.0mL of 1.500 M solution.

3 0

4 years ago

Which substance can be decomposed by a chemical change?

11111nata11111 [884]

The answer to this question would be: ammonia
Chemical decomposition is the breakdown of a compound into smaller compound or element. In this question, the Sodium(Na), Argon (Ar) and Sulfur(S) is elements, not compounds.
An element should not breakable since it was the simplest form.
Ammonia(NH3) is a compound so it should be able to be decomposed.

7 0

3 years ago

If you took a spoonful of tea out of the cup, which would be more painful if it spilled on you? *

serg [7]

Based on my understanding of this question in my opinion atleast small sharp pain is worse so the cup would be more painful as it would spread that sensation over a large part of the body. (Hope this helps have a great day)

6 0

3 years ago