P O₂ = 736.2 torr
<h3>Further explanation</h3>
Given
P tot=760 torr
P H₂O = 23.8 torr
Required
P gas/O₂
Solution
Dalton's law of partial pressures stated that
<em>the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
</em>
Can be formulated:
P tot = P1 + P2 + P3 .... Pn
P tot = P H₂O + P O₂
760 torr = 23.8 torr + P O₂
P O₂ = 760 - 23.8
P O₂ = 736.2 torr
Answer:
A. Precipitation
Explanation:
<u>Precipitation</u> is any form of water that falls to the Earth from the sky.
Examples of Precipitation are:
Answer:
0.02564 kg ore contain 10.0 g of nickel.
Explanation:
Given data:
Percentage of nickel in ore = 39.0%
Mass of ore required to have 10 g of nickel = ?
Solution:
39.0% means that 39.0 g of nickel is present in 100 g of ore thus,
39/100 = 0.39
0.39 × X = 10.0 g
X = 10.0 g/0.39
X = 25.64 g
Gram to kilogram:
25.64 g × 1kg /1000 g
0.02564 kg
Answer: m = 74.7 g Ca(OH)2
Explanation: To solve this problem we will use the formula for Molarity which is M = n /L, where n is the number of moles and L represents volume in liters. Derive for n to find moles then convert it to mass using the molar mass of the compound.
First convert mL to L
532.0 mL ( 1 L / 1000 mL ) = 0.532 L
n = M L
= 1.90 M ( 0.532 L )
= 1.01 moles Ca(OH)2
Convert moles to mass:
= 1.01 moles Ca(OH)2 x 74 g Ca(OH)2 / 1 mole Ca(OH)2
= 74.7 g Ca(OH)2
Answer:
C. fluorine (F) and chlorine (Cl)
D. arsenic (As) and antimony (Sb)
Explanation:
In the periodic table , all the elements are arranged according to the atomic number ,
and the elements are placed in groups and periods ,
The elements with similar chemical and physical properties are placed in a common group .
The elements present in the same group have the same number of valence electrons in the valence shell .
Hence , from the given options ,
fluorine (F) and chlorine (Cl) belongs to group 17 with 7 valence electrons in the outermost shell .
arsenic (As) and antimony (Sb) belong to group 15 with 3 valence electrons in the outermost shell .