Answer:
20.5 × 10²³ molecules of He
Explanation:
Given data:
Number of moles of He = 3.40 mol
Number of molecules of He = ?
Solution:
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
For 3.40 moles of He:
3.40 mol × 6.022 × 10²³ molecules
20.5 × 10²³ molecules of He
Answer:
it is a physical change because when you heat up again a solution of sugar and tea you gonna obtain again sugar
<span>1. </span>To solve this we assume
that the gas is an ideal gas. Then, we can use the ideal gas equation which is
expressed as PV = nRT. At a constant temperature and number of moles of the gas
the product of PV is equal to some constant. At another set of condition of
temperature, the constant is still the same. Calculations are as follows:
P1V1 =P2V2
V2 = P1 x V1 / P2
V2 = 203 x 40.0 / 35.0
V2 =232 L
<span>pOH = 9.2
pH = 4.8</span><span>
That's your </span>answer!!
Hope I helped!! :)
<span>10% of the 25% of people that prefer to swim on weekends are female.
Multiply 10% and 25% to get 0.025
</span><span> 55% of the 75% are females who prefer to swim on the weekdays.
Multiply them together getting 0.4125
</span>
<span>Divide 0.25 by 0.10= 0.40</span>
