Answer:
0.0025g/cm³
Explanation:
Given parameters:
Mass of the brown sugar = 12.9g
dimension of the sugar = 8cm
unknown:
density of the sugar = ?
Solution
Density is defined as the mass per unit volume of a substance. The expression is given below:
Density =
We know the mass of the substance but the volume is unknown:
Volume of the brown sugar = l x bx h = 8x8x8 = 512cm³
Density of the brown sugar = = 0.0025g/cm³
Answer:
b) 18.5 g
Explanation:
The first step is the <u>calculation of number of moles</u> of with the molarity equation, so:
With the <u>volume in "L" units</u> (342.6 mL= 0.342 L ) we can <u>find the moles</u>, so:
Now, we have to calculate the <u>molar mass</u> to convert the moles to grams. For this we have to know the <u>atomic mass</u> of each atom:
Li ( 6.94 g/mol)
N (14 g/mol
O (16 g/mol)
With these values and the number of atoms in the molecule we can do the math:
(6.94 x 1) + ( 14 x 1) + (16 x 3 ) = 68.94 g/mol
The final step is the <u>calculation of the grams</u>, so:
<u>We will need 18.5 g of LiNO3 to do a 0.783 M solution with a volume 342.6 mL.</u>
Answer:
<h2>1. Ionic compound-Explanation:
Mg is a metal that has 12 atomic numbers and thus its electronic configuration is . The outer most shell of this element has 2 electrons so it loses 2 electrons and thus form
ions. Br is a nonmetal and has 35 atomic number so its electronic configuration is
. Since its outermost shell has 7 electrons so it can accept one electron and thus forms
. So magnesium ion and bromide ion combine and forms an ionic compound
.
P is also a nonmetal and combine with Br with covalent bond and due to electronegativity differences form polar covalent compound such as .