Answer:
To calculate the percentage of a specific number, you first convert the percentage number to a decimal. This process is the reverse of what you did earlier. You divide your percentage by 100. So, 40% would be 40 divided by 100.
Explanation:
Answer:
You multiply the 3 numbers together to get your volume, in this case it would be 4058.488 cm^3 (cm cubed)
so
V: 4058.488cm^3 ( round up to 4058.5 for convenience)
M: 27579
D: ?
So we divide mass by the volume to get density, which is
27579 / 4058.5 = ~6.79536 (can round up to 7 or 6.8)
This graph can help a lot, so maybe try and memorize it, hope I helped.
6.3 ×

In scientific notation, the numerical value without the exponent of 10 must be within the range from 1 to just below 10 (for example, 9.99...). In this case, 6.3 is already within this range, so we just have to multiply it by 1. To get a multiplier of 1 using base 10, we would have to raise 10 to the zeroth power.
Answer:
Mass = 24.4 g
Explanation:
Given data:
Mass of lithium nitride needed = ?
Volume of ammonia = 15.0 L
Solution:
Chemical equation:
Li₃N + 3H₂O → NH₃ + 3LiOH
One mole = 22.414 L
We will compare the volume of lithium nitride and ammonia.
NH₃ : Li₃N
22.414 : 22.414
15.0 : 15.0
Number of moles of lithium nitride:
PV = nRT
n = 1 atm ×15 L / 0.0821 atm.L / mol.K × 273 K
n = 15 /22.41 /mol
n =0.7
Mass of Lithium nitride:
Mass = number of moles × molar mass
Mass = 0.7 mol × 34.83 g/mol
Mass = 24.4 g
When you are making a cake "for example" you put all the ingrediants together.. thrn put it in the oven.. the combination that makes the cake look like that or that combines the ingrediants together is by chemical reaction.