Answer:
210438+28+5+8+2+2+8+30+5+8+6+8+2+5+3+82+8+9+2+8+8+5+5+5+6+9+2+56+5+6+5+-3+8+8+58+5+6+8+5+8+5+35+6+3+8+5+3+68+6+8+6+88+8+!?=8+5+55+5+5+5+5+5+5+5+5+5+2+58+0+80=0=0=00=
Answer:
B.
Explanation:
The telescopes of the 1600s were gradually improved upon over time, resulting in the telescopes that are available today.
Answer:
6.022 × 10²³ molecules of B₂H₆
Explanation:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
B₂H₆ molecules:
21.63 g = one mole of B₂H₆= 6.022 × 10²³ molecules of B₂H₆
0.025 is how many moles of oxygen to react with NH3
Answer:
Pulley
Explanation:
You can't the piano up the stairs, you need to something to bring it up
