Answer:
B
Explanation:
I picked b because the hider the flow current
Answer:
The models which shows 6 electrons in the outer shell are Oxygen, Sulfur, Selenium, Tellurium and the radioactive element Polonium
<h2>Hello!</h2>
The answer is: 4.71 grams of Hydrogen
<h2>
Why?</h2>
From the statement, we know that for the studied compound, which has a mass of 124 g, we have that 3.80% is Hydrogen.
So, to find how many grams of Hydrogen is in 124 grams of the compound, we need to do the same calculation:
First, we need to convert the 3.80% percent in a real number, we can do it by dividing the percent into 100:
Then,
So, there are 4.71 grams of Hydrogen in 124 grams of the compound.
Have a nice day!
Hey there!
The answer is biotic! Biotic are all living factors in an ecosystem.
Hope this helped!
Answer:
Explanation:
We are asked to convert 1.45 moles of potassium hydroxide (KOH) to grams.
<h3>1. Molar Mass</h3>
The molar mass is the mass in grams of 1 mole of a substance. The values are found on the Periodic Table. They are the same as the atomic masses but the units are grams per mole (g/mol) instead of atomic mass units (amu).
We have the compound KOH. Look up the molar masses of the individual elements.
- Potassium (K): 39.098 g/mol
- Oxygen (O): 15.999 g/mol
- Hydrogen (H): 1.008 g/mol
The formula for the compound has no subscripts, so there is 1 mole of each element in 1 mole of the compound. We can simply add the molar masses.
- KOH: 39.098 + 15.999 + 1.008 =56.105 g/mol
<h3>2. Convert Moles to Grams</h3>
Based on the molar mass, there are 56.105 grams of KOH in 1 mole. Create a ratio using this information.
We are converting 1.45 moles of KOH to grams, so we multiply by this value.
The units of moles of KOH cancel.
<h3>3. Round </h3>
The original measurement of moles has 3 significant figures, so our answer must have the same.
For the number we calculated, that is the tenths place. The 5 in the hundredths place (81.3<u>5</u>225) tells us to round the 3 up to a 4.
<u>Approximately 81.4 grams of potassium hydroxide </u>are represented by 1.45 moles.