Answer:
![\boxed {\boxed {\sf A. \ 54 \ grams }}](https://tex.z-dn.net/?f=%5Cboxed%20%7B%5Cboxed%20%7B%5Csf%20A.%20%5C%2054%20%5C%20grams%20%7D%7D)
Explanation:
To convert from moles to grams, we must use the molar mass.
Recall that water's molecular formula is H₂O. It contains hydrogen and oxygen. Look up the two elements masses on the Periodic Table.
- Hydrogen (H): 1.008 g/mol
- Oxygen (O): 15.999 g/mol
Now, use these masses to find water's mass. The subscript of 2 tells us there are 2 atoms of hydrogen, so we multiply hydrogen's mass by 2 and add oxygen's.
- H₂O= 2(1.008 g/mol) + 15.999 g/mol = 18.015 g/mol
Use the molar mass as a ratio.
![\frac{18.015 \ g \ H_2 O}{ 1 \ mol \ H_2 O}](https://tex.z-dn.net/?f=%5Cfrac%7B18.015%20%5C%20g%20%5C%20H_2%20O%7D%7B%201%20%5C%20mol%20%5C%20H_2%20O%7D)
Multiply by the given number of moles.
![3 \ mol \ H_2O*\frac{18.015 \ g \ H_2 O}{ 1 \ mol \ H_2 O}](https://tex.z-dn.net/?f=3%20%5C%20mol%20%5C%20H_2O%2A%5Cfrac%7B18.015%20%5C%20g%20%5C%20H_2%20O%7D%7B%201%20%5C%20mol%20%5C%20H_2%20O%7D)
The moles of water will cancel.
![3 *\frac{18.015 \ g \ H_2 O}{ 1 }](https://tex.z-dn.net/?f=3%20%2A%5Cfrac%7B18.015%20%5C%20g%20%5C%20H_2%20O%7D%7B%201%20%7D)
![3 *{18.015 \ g \ H_2 O}](https://tex.z-dn.net/?f=3%20%2A%7B18.015%20%5C%20g%20%5C%20H_2%20O%7D)
![54.045 \ g \ H_2O](https://tex.z-dn.net/?f=54.045%20%5C%20g%20%5C%20H_2O)
Round to the nearest whole number. The 0 in the tenth place tells us to leave the number as is.
![54 \ g \ H_2O](https://tex.z-dn.net/?f=54%20%5C%20g%20%5C%20H_2O)
There are about <u>54 grams</u> of water in 3 moles.
It's the mitochondrion. It it the powerhouse of the cell and deals mainly with energy.
The electrons is the answer
Closed system. If the system is not closed, matter or energy can escape from the system. an example of this is if you react magnesium and hydrochloric acid in a open system. The H₂ gas is going to escape making it look like some of the mass disappeared . in that same reaction some in an open system will also loose heat to the surrounding which will make it look like less heat was produced.
Answer:
Mg
Explanation:
Magnesium has a valency of +2