You stay out in the sun too long and get sunburned. What type of energy transfer causes your sunburn?

A laboratory analysis of a 100 g sample finds it is composed of 1.8 g hydrogen, 56.1 g sulfur, and 42.1 g oxygen. What is its em

Neporo4naja [7]

Answer: The empirical formula is $H_2S_2O_3$

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mas of H = 1.8 g

Mass of S = 56.1 g

Mass of O = 42.1 g

Step 1 : convert given masses into moles.

Moles of H = $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{1.8g}{1g/mole}=1.8moles$

Mass of S = $\frac{\text{ given mass of S}}{\text{ molar mass of S}}= \frac{56.1g}{32g/mole}=1.8moles$

Moles of O= $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{42.1g}{16g/mole}=2.6moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For H = $\frac{1.8}{1.8}=1$

For S = $\frac{1.8}{1.8}=1$

For O = $\frac{2.6}{1.8}=1.5$

Converting to whole number ratios

The ratio of H: S: O= 2: 2: 3

Hence the empirical formula is $H_2S_2O_3$

7 0

3 years ago

Which of the following could result from a substance that

sukhopar [10]

The features that can be observed from a substance that undergoes a chemical change is that the shape is altered. That is option D.

<h3>What is a chemical change?</h3>

A chemical change is the change in which two or more chemical substances involved in a chemical reaction rearranges their chemical bonds to form a new product.

In the chemical change, the shape of an object can be changed and the object will still remain true to its chemical composition.

Therefore, the features that can be observed from a substance that undergoes a chemical change is that the shape is altered.

Learn more about chemical reaction here:

brainly.com/question/11231920

#SPJ1

6 0

2 years ago

An aqueous potassium iodate ( KIO3 ) solution is made by dissolving 562 562 grams of KIO 3 KIO3 in sufficient water so that the

maxonik [38]

Answer:

Molarity of $KIO_{3}$ solution is 0.612 mol/L

Explanation:

Number of moles of a substance = (mass of substance)/(molar mass of the substance)

Molar mass of $KIO_{3}$ = 214 g/mol

So, 562 g of $KIO_{3}$ = $\frac{562}{214}$ moles of $KIO_{3}$ = 2.63 moles of $KIO_{3}$

Molarity of a solution = (number of moles of solute in solution)/(total volume of solution in liter)

Here solute is $KIO_{3}$ and solvent is water

Total volume of solution is 4.30 L

So, molarity of $KIO_{3}$ solution = $\frac{2.63}{4.30}mol/L$ = 0.612 mol/L

3 0

3 years ago

A compound is a pure substance made up of two or more different atoms joined by chemical bonds. Consider the composition of the

wolverine [178]

Answer:

Carbon dioxide is a compound

Explanation:

It is formed by chemical combination of carbon and oxygen atoms

5 0

3 years ago

List any two uses of Brass , Bronze , Sulphur , Iodine

NikAS [45]

BRASS :It is easy to form into various shapes, a good conductor of heat, and generally resistant to corrosion from salt water. 1 pipes and 2 tubes, 3 screws, 4 cartridge casings for firearms.

BRONZE :for bearings because of its friction properties, and as 1 musical instruments ,2 and medals

Sulphur :1 making car batteries, 2 fertilizer

IODINE :1 Iodine regulates skin moisture levels and aids in the healing of cuts and scars through cellular regeneration. 2 Iodine also regulates the hormones responsible for acne breakouts.3 Treating thyroid cancer.

5 0

3 years ago