Answer : The number of drops it takes from a dropper to dispense 1.0 ml of ethanol is, 20 drops
Solution : Given,
Density of ethanol = 0.80 g/ml
Mass of ethanol = 0.60 g
First we have to calculate the volume of ethanol.
Formula used : 
The volume of ethanol is, 0.75 ml
Now we have to calculate the number of drops it takes from a dropper to dispense 1 ml of ethanol.
As, the number of drops in 0.75 ml of ethanol = 15
So, the number of drops in 1.0 ml of ethanol = 
Therefore, the number of drops it takes from a dropper to dispense 1.0 ml of ethanol is, 20 drops
2 NI₃= N₂ + 3 I₂
2 x 394.71 g --------------- 3 x 253.80 g
3.58 g ---------------------- ( mass of I₂ )
3.58 x 3 x 253.80 / 2 x 394.71 =
2725.812 / 789.42 => 3.4529 g of I₂
1 mole I₂ --------------- 253.80 g
?? ----------------------- 3.4529 g
3.4529 x 1 / 253.80 => 0.0136 moles of I₂
Answer C
hope this helps!
Answer:- 123 amu.
Solution:- The formula to calculate the average atomic mass of an atom is:
Average atomic mass = mass of first isotope(abundance of first isotope) + mass of second isotope(abundance of second isotope)
Note: The percent abundance is converted to decimals.
mass of Sb-121 is 121 amu and it's percent abundance is 57.3% and in decimal it is 0.573. Percent abundance of Sb-123 is 42.8% and in decimal it is 0.428. We are asked to calculate it's mass. The average atomic mass of Sb is given as 122.
Let's say the mass of Sb-123 is M and plug in the values in the formula and do calculations:
122 = 121(0.573) + M(0.428)
122 = 69.333 + M(0.428)
On rearrangement:-
M(0.428) = 122 - 69.333
M(0.428) = 52.667
M = 123
So, the mass of Sb-123 is 123 amu.
Answer: Ion-ion forces, also known as ionic bonding, are the simplest to understand. These forces arise from the electrostatic attraction between two ions with opposite charges.
Explanation:
Conduction is the act of touching 2 solids where one transfers heat
