To determine the amount of a certain element in a compound, we use the ratio of the elements from the compound. We calculate is follows:
45.0 g CCl4 ( 1 mol CCl4 / 153.82 g CCl4 ) ( 1 mol C / 1 mol CCl4 ) ( 12.01 g C / 1 mol C ) = 3.5135 g carbon present
Hope this answers the question. Have a nice day.
<u>Question in English : </u>
<span>
<em>An atom X has 8 neutrons and its atomic number equals 8. Knowing that this atom is isotopes of Y, which has mass number 18, answer: What is the number of neutrons in atom Y?</em>
</span><span><u>Answer :</u>
</span>Isotopes are defined as the atoms which have same number of
protons but different number of neutrons of same element. Since the proton
number is same, the atomic number also same. Hence the atomic number of Y is 8.
Mass number = atomic number + neutron number
18 = 8 + neutron number
Neutron number = 10
Hence, there are 10 neutrons in Y.
Answer:
There are many properties that differentiate metals from non-metals. They are: Luster, conductivity of heat and electricity, physical strength i.e. Brittle or difficult to break, etc.
It is possible because the electrons in the energy level furthest from the nucleus delocalise, this leaves behind positively charged metal ions which are attracted to the negatively charged electrons that now move around the lattice freely
Answer:
percentage by mass of Ba = 0.4583/0.8360 × 100 = 45.83
/0.8360 = 54.82%
Explanation:
The mass of Barium in the original compound is the same as the masss of barium in the precipitate BaSO4.
Ba²+
molar mass of BaSO4 = 137 + 32 + 16(4) = 137 + 32 + 64 = 233 g/ mol
since
137 grams of barium is in 233 g of BaSO4
? grams of barium is in 0.7794 g of BaSO4
cross multiply
grams of barium = 0.7794 × 137/233
grams of barium = 106.7778/233
grams of barium = 0.45827381974
grams of barium = 0.4583 grams
percentage by mass of Barium in the original compound =
mass of barium/ mass of the compound × 100
mass of barium = 0.4583 g
mass of compound = 0.8360 g
percentage by mass of Ba = 0.4583/0.8360 × 100 = 45.83
/0.8360 = 54.82%
