This problem requires that you know nomenclature, to identify the formula of the compond from its name, and the way how to determine the formula mass once you know formula.
1) Nomenclature: Chromate
Chromate is an ion (anion) from the chromic acid.
Chromic acid is formed from Chromic oxyde with the atomic number 6.
Then Cr + O2 -> Cr2O6 = CrO3
CrO3 + H2O -> H2CrO4
H2CrO4 = 2H(+) + CrO4 (2-) <---- this is the ion chromate
Now you have to join the chromate ion with the sodium ion => Na2 (CrO4)
2) Now you can calculate the molar mass of the formula Na2(CrO4).
You must only muliply every subscript times the atomic mass of the element:
Na2 => 2 * 23 g/mol = 46 g/mol
Cr => 52 g/mol
O4 => 4 * 16g/mol = 64 g/mol
Formula mass = 46 g/mol + 52 g/mol + 64 g/mol = 162 g/mol
I used the numbers with less significant figures thant the problem required but the answer is evident. Also, g / mol = a.m.u = atomic mass unit.
Answer: 161.97 a.m.u
The molar mass of the product is equal to 62g/mol.
<h3>Mole calculation</h3>
To calculate the molar mass of a compound it is necessary to have knowledge of the atomic mass of all the elements involved.
In the case of the question, we have the reaction between flourine and magnesium, which represents the element of group 2 with the presented electronic configuration.
Thus, we have the following reaction:
So, just add the molar masses, having:
So, the molar mass of the product, round to the nearest tenth, is equal to 62g/mol.
Learn more about mole calculation in: brainly.com/question/2845237
Answer:
4d orbital.
Explanation:
Hello!
In this case, since zirconium's atomic number is 40, we fill in the electron configuration up to 40 as shown below:
Thus, the orbital 4d is partially filled.
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Answer:
1. aa
2. They have similar DNA
Explanation:
1. According to the question 1, wrinkled seeds (A) are dominant over round seeds (a) in pea plants. This means that, based on the law of dominance proposed by Mendel, wrinkled seeds will be expressed over round seeds in a heterozygous state (Aa).
However, since the round seed phenotype is a recessive trait, it will only be expressed when the alleles for round seeds (a) are the same in the gene i.e. aa genotype.
2. Based on the information in question 2, Ricky, who is working on a family tree for his school project, realizes that his close relatives all look similar in the pictures he collected. This is possible because of the SIMILARITY OF THEIR DNA (genetic material). Note that, relatives are connected by the genes that are inherited from one another, hence, they possess a similar DNA, which is the most valid reason for the resemblance.
<h2>The number of moles of formaldehyde can be produced by reacting 4.0 moles of methanol with 4.0 moles of oxygen gas is
<u>
8 moles</u></h2>
<u> explanation</u>
write a balanced chemical reaction
that is 2 CH3OH (l) + O2 (g) → 2HCOH (l)+ 2H2O (l)
from the reaction above 2 moles of CH3OH reacted with 1 moles of O2 to form 2 moles of HCOH and two moles of H2O
This imply that O2 is the limiting reagent ,therefore by use of mole ratio between O2 : HCOH which is 1 :2 the moles of HCOH= 2 x4 = 8 moles