The greenish color of plant cells comes from

C, h, o, n, p and s make up > 90% of all organic compounds. t or f?

Shtirlitz [24]

True is does make up 90 percent

5 0

3 years ago

If 21.8 g of NO and 13.8 g of O2 are used to form NO2, how many

mario62 [17]

Answer:

Explanation:

1 . Write the chemical equation.

2 . Calculate the moles of product from the first reactant.

3 . Calculate the moles of product from the second reactant.

4 . Identify the limiting reactant and the excess reactant.

5 . Calculate the mass of excess reactant used up.

6 . Calculate the mass of unused excess reactant.

7 . Calculate the mass of limiting reactant needed to react with the 8 . unused excess reactant.

3 0

3 years ago

Methane and chlorine react to form four products: CH3Cl, CH2Cl2, CHCl3, and CCl4. At a particular temperature and pressure, 38.4

Anastasy [175]

Answer:

How many grams of CCL4 were formed? 116.9 g

How many grams of Cl2 reacted with the CH4? 243.8 g

Explanation:

First we need to know the molar mass for every element or compound in the reaction:

$M_{CH_{4}}=16 g/mol\\M_{CH_{3}Cl}=50.49g/mol\\M_{CH_{2}Cl_{2}}=84.93g/mol\\M_{CHCl_{3}}=119.38g/mol\\M_{CCl_{4}}=153.82g/mol$

Now we proceed to calculate the amount of moles produced, per product:

$n_{CH_{4}}=2.4\\n_{CH_{3}Cl}=0.18\\n_{CH_{2}Cl_{2}}=0.55\\n_{CHCl_{3}}=0.91\\n_{CCl_{4}}=n_{CH_{4}}-(n_{CH_{3}Cl}+n_{CH_{2}Cl_{2}}+n_{CHCl_{3}})\\n_{CCl_{4}}=0.76mol\\m_{CCl_{4}}=n_{CCl_{4}}*M_{CCl_{4}}\\m_{CCl_{4}}=116.9g$

To calculate the mass of chlorine we just need to make a mass balance:

$m_{CH_{4}}+m_{Cl_{2}}=m_{CH_{3}Cl}+m_{CH_{2}Cl_{2}}+m_{CHCl_{3}}+m_{CCl_{4}}\\m_{Cl_{2}}=m_{CH_{3}Cl}+m_{CH_{2}Cl_{2}}+m_{CHCl_{3}}+m_{CCl_{4}}-m_{CH_{4}}\\m_{Cl_{2}}=243.8g$

3 0

3 years ago

Which of the following measurements would be different for the same object on the earth and on the moon?

Tema [17]

The gravity takes place in the objects

3 0

3 years ago

Which statements are true of solutions? They contain solutes and solvents. They always have only one solute per solvent. Their p

melamori03 [73]

Explanation:

When two or more substances are mixed together in such a way that their particles are evenly distributed throughout the mixture then it is known as a solution.

Basically, a solution is a homogeneous mixture which can be present in any phase.

A solution contains both solute and solvent.

A colloid is defined as a substance in which solute particles are microscopically distributed throughout the solvent. In a colloid both solvent and solute are present in liquid phase.

Hence, a solution can be easily distinguished from colloids.

Therefore, we can conclude that following statements about solutions are true:

They contain solutes and solvents.

Their particles must be evenly distributed.

They may contain solid, liquid, and gas simultaneously.

They are always easy to distinguish from colloids.

They are homogeneous matter.

5 0

4 years ago

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