Answer:
62.73g
Explanation:
Using the following formula;
Molarity = n/V
Where;
n = number of moles (mol)
V = volume (L)
From the information given below,
V = 230mL = 230/1000 = 0.230L
M = 3.21 M
3.21 = n/0.230
n = 3.21 × 0.230
n = 0.738 mol of KNO2
Molar mass of KNO2 = 39 + 14 + 16(2)
= 53 + 32
= 85g/mol
mole = mass/molar mass
0.738 mol = mass/85g/mol
Mass = 0.738 × 85
mass = 62.73g
Is easy for regular. If you are taking AP, it’s hard.
What kind of bears dissolve in water?
Polar bears
Answer:
(A) fossil is the most useful.
It serves as an index fossil. The seashell is a great index fossil because it only appears in the sandstone layer in multiple locations in the same layer of time.
Explanation:
According to Bronsted-Lowry theory of acids and bases, an acid is proton donor and a base is proton acceptor. When an acid loses the proton, it forms the conjugate base of the acid. Similarly when a base accepts a proton, it forms the conjugate acid if that base. A conjugate acid base pair differs by a single proton.
Given the weak acid . It can lose a proton to form the conjugate base.
Therefore, the conjugate base of is .