Ask question

Ask question

All categories

2 years ago

13

An element has two isotopes. 90% of the isotopes have a mass number of 20 amu, while 10% have a mass number of 22 amu. Calculate

the Average Atomic Mass of the element

1 answer:

jek_recluse [69]2 years ago

8 0

Explanation:

aam= 90%•20amu+10%•22amu/100

aam= 2020/100

aam= 20.2

You might be interested in

Which equation has x = 5 as the solution?

Natali5045456 [20]

Answer:

x-10 should be the answer

8 0

2 years ago

________ are molecules whose general structure includes a central carbon with a carboxyl group, an amine group, a hydrogen molec

IgorLugansk [536]

The amino acids are the molecules where we can found the carboxyl group (- $COO^{-}$ ), amino group (- $NH_{2}$ ), hydrogen atom (H) and a residual R-group. On the structure of the residual R-group the name of the amino acid depends. Like if R is hydrogen (H) the amino acid is alanine; If R- group is a phenyl group i.e. $-C_{6}H_{5}$ , the compound is called phenyl alanine. The structure of the general amino acid skeleton can be shown as-

5 0

2 years ago

What are the energy in a plant?

Vadim26 [7]

In plants, these energy factories are called chloroplasts. They collect energy from the sun and use carbon dioxide and water in the process called photosynthesis to produce sugars. Animals can make use of the sugars provided by the plants in their own cellular energy factories, the mitochondria.

3 0

2 years ago

You may have to recrystallize any or all of the components of your extraction mixture, benzoic acid, ethyl-4-aminobenzoate and f

hjlf

Answer:

the Recrystallization solvents are;

-Sodium Hydroxide Base (NaOH)

- Hydrochloric Acid (HCl)

- Sand bath when acidic and basic components are removed.

Explanation:

Recrystallization is simply a technique used to purify an impure compound in a solvent.

Now, we want to purify the mixture of benzoic acid, Ethyl-4-aminobenzoate and fluorenone.

For the benzoic acid, it can be separated out of the mixture by addition of sodium hydroxide base (NaOH).

The Ethyl - 4 - aminobenzoate will be separated from the mixture by the addition of Hydrochloric Acid (HCl).

The fluorenone would be separated out by heating the mixture in a sand bath after the basic and acidic components have already been extracted out.

Thus, the Recrystallization solvents are;

-Sodium Hydroxide Base (NaOH)

- Hydrochloric Acid (HCl)

- Sand bath when acidic and basic components are removed.

6 0

2 years ago

How many kg of carbon dioxide are used per year to produce their arm and hammer baking soda?

cestrela7 [59]

The complete question would be as follows:

700,000 tons of baking soda are produced per year. <span>How many kilograms of carbon dioxide are used per year to produce baking soda?

We calculate as follows:

</span><span>CO2(g) + NH3(aq) + NaCl(aq) + H2O -----> NaHCO3(s) + NH4Cl(aq)
</span>
700000 tons NaHCO3 ( 907.185 kg / 1 ton ) (<span>1 kmole NaHCO3 / 84.0 kg NaHCO3) x (1 kmole CO2 / 1 kmole NaHCO3) x (44.0 kg CO2 / 1 kmole) = 3x10^8 kg CO2

Hope this answers the question. Have a nice day.</span>

3 0

3 years ago