For the following word equations, write it as a chemical equation, then balance it.

4. For many students, the reaction flask will become warmer during oxygen generation and the reaction rate will become faster. E

vladimir2022 [97]

Answer:

See below

Explanation:

Reactions require successful collisions between elements or molecules. A rise in temperature increases the movement of molecules. The more movement, the more collisions. The more collisions, the more reactions. The collisions release energy as heat which warms the flask and so on.

8 0

3 years ago

Calculate the molality of a 20.0 percent by weight aqueous solution of nh4cl. (molecular weight: nh4cl = 53.5)

cestrela7 [59]

Unfortunately the data provided doesn't include the DENSITY of the ammonium chloride solution and molarity is defined as moles per volume. So without the density, the calculation of the molarity is impossible. But fortunately, there are tables available that do provide the required density and for a 20% solution by weight, the density of the solution is 1.057 g/ml.
So 1 liter of solution will mass 1057 grams and the mass of ammonium chloride will be 0.2 * 1057 g = 211.4 g. The number of moles will then be 211.4 g / 53.5 g/mol = 3.951401869 mol. Rounding to 3 significant digits gives a molarity of 3.95.
Now assuming that your teacher wants you to assume that the solution masses 1.00 g/ml, then the mass of ammonium chloride will only be 200g, and that is only (200/53.5) = 3.74 moles.
So in conclusion, the expected answer is 3.74 M, although the correct answer using missing information is 3.95 M.

8 0

4 years ago

Read 2 more answers

Compete the following table comparing atomic mass and mass number by enteng Yes or No in each box.

Dennis_Churaev [7]

Answer:

atomic mass; mass number

1) NO ; YES

2) YES ; YES

3) YES ; YES

4) YES ; NO

5) NO; YES

Explanation:

An atomic mass is the mass of a single atom of a chemical element. It includes the masses of the 3 subatomic particles that make up an atom: protons, neutrons and electrons.

And also 1 atomic mass unit is defined as $\frac{1}{12}$ of the mass of a single carbon-12 atom.

Now, mass number of an element is the sum of protons and neutrons present in a single atom of that element.

Mass of the electrons is 9.10938356 × 10⁻³¹ kilograms

which is negligible.

And mass of proton and neutron is nearly but not exactly 1 u.

so, mass number is nearly but not exactly equal to atomic mass ,most of the times.

so,

1) only mass number can be used to calculate number neutrons present by simple subtracting atomic number(proton number) in mass number

2) both of these are found in periodic table

3) both can be found for individual atoms

4) mass number are different for isotopes but the atomic mass is calculated considering the isotopes(depends on availability of isotopes)

5)only mass number is given in isotopic symbol.

8 0

3 years ago

Determine the empirical formula for a compound that is found to contain

Sphinxa [80]

Answer:

The empirical formula is PCl3

Explanation:

Mass of P is 30.97 g, thus 1.523 g of P equivalent to 0.05 moles of P

Mass of Cl is 35.45 g, thus 5.228 g of Cl equivalent to 0.15 moles of Cl

Therefore moles of P : moles of Cl = 0.05:0.15 = 1:3

Therefore the empirical formula, PCl3

7 0

3 years ago

(ii) Calculate the maximum mass of ethanol that could be obtained<br> g from 30.0 g of glucose.

Step2247 [10]

Taking into account the reaction stoichiometry, 15.33 grams ethanol could be obtained from 30 grams of glucose.

<h3>Reaction stoichiometry</h3>

In first place, the balanced reaction is:

C₆H₁₂O₆ → 2 C₂H₅OH + 2 CO₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

C₆H₁₂O₆: 1 mole
C₂H₅OH: 2 moles
CO₂: 2 moles

The molar mass of the compounds is:

C₆H₁₂O₆: 180 g/mole
C₂H₅OH: 46 g/mole
CO₂: 44 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

C₆H₁₂O₆: 1 mole ×180 g/mole= 180 grams
C₂H₅OH: 2 moles ×46 g/mole= 92 grams
CO₂: 2 moles ×44 g/mole= 88 grams

<h3>Mass of C₂H₅OH formed</h3>

The following rule of three can be applied: if by reaction stoichiometry 180 grams of glucose form 92 grams of ethanol, 30 grams of glucose form how much mass of ethanol?

$mass of ethanol=\frac{30 grams of glucosex 92 grams of ethanol}{180 grams of glucose}$

<u><em>mass of ethanol= 15.33 grams</em></u>

Then, 15.33 grams ethanol could be obtained from 30 grams of glucose.

Learn more about the reaction stoichiometry:

brainly.com/question/24741074

brainly.com/question/24653699

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3 0

2 years ago