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taurus [48]
4 years ago
12

Determine the percent composition for each of the elements in magnesium nitrate, Mg(NO3)2. Please round to the nearest whole num

ber. First, find the molar mass of the WHOLE compound. Use whole numbers for the atomic mass. Mg(NO3)2
Chemistry
1 answer:
Verizon [17]4 years ago
8 0

Answer:

% Mg = 16.2 % ≈ 16 %

%N = 18.9 % ≈ 19 %

% O = 64.9 % ≈ 65 %

Explanation:

Step 1: Data given

Molar mass Mg(NO3)2 = 148 g/mol

Molar mass Mg = 24 g/mol

Molar mass N = 14 g/mol

Molar mass O = 16 g/mol

Step 2: Calculate the percent composition

% Mg = (24/148) *100%

% Mg = 16.2 % ≈ 16 %

% N = (2*14 / 148) * 100%

%N = 18.9 % ≈ 19 %

% O = (6*16/148) * 100%

% O = 64.9 % ≈ 65 %

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A binary ionic compound is known to contain a cation with 51 protons and 48 electrons. The anion contains one-third the number o
7nadin3 [17]

Answer:

SbCl_3

Explanation:

The cation contains 51 protons and 48 electrons. The electrons are only lost not protons, so the element which corresponds to atomic number 51 is the cation which is Antimony (Sb).

Also, the charge on the cation is 51 - 48 = 3

This is because neutral atom contains the same number of electrons as protons.

Given the anion has one-third protons as cation which means thta:

Number of protons in anion = \frac {51}{3}=17

This corresponds to chlorine atom. The electrons are 1 greater than protons means that it has gain 1 electron.

So,

Sb     Cl

3         1

Cross multiply the valency.

So, formula is SbCl_3

4 0
3 years ago
What are Newton's three laws of motion? Are they correct?​
muminat

Answer:

Explanation:

Of course Newton's three laws of motion are correct, because they were verified several hundred of years ago and they continue working today, for such systems. Science is accumulative. What modern physics has done is to constraint the range of validity of those laws.

Newtons first law of motion states that everybody continues in it rest or of uniform motion in a straight line unless an external force is applied on it.

Newtons second law of motion states that acceleration produced on a body by a force is directly proportional to the applied force and inversely proportional to the mass of body.

Newtons third law of motion states that to every action there is equal and opposite reaction.

Hope it will be helpful :)

8 0
4 years ago
What are three ways that carbon atoms can be arranged in hydrocarbon molecules?
Slav-nsk [51]
Answer is: carbon atoms can be arranged s<span>traight chain, branched chain and ring.
</span>Hydrocarbon<span> is an </span>organic compound<span> consisting of </span>hydrogen<span> and </span><span>carbon.
</span><span>In s</span>traight chain<span> carbon atoms are bonded with only two other carbon atoms in elongate chain.
</span>In branched chain at least one carbon is bonded with more than two other carbon atoms.
Ring chain hydrocarbons are <span>cyclic </span><span>hydrocarbons</span>.
7 0
3 years ago
What do these two changes have in common?
Vladimir79 [104]
They are both physical changes (change in physical structure/appearance)

hope this helps :)
6 0
3 years ago
What is the Percent composition of a pure substance that contains 7.22g of nickel, 2.53g of phosphorus and 5.25 g oxygen
emmasim [6.3K]

Answer:

Explanation:

Total mass of substance = 7.22 + 2.53 + 5.25 g

= 15 g

percentage of nickel = 7.22 x 100 / 15

= 48.13

= 48.1 %

percentage of phosphorus  = 2.53 x 100 / 15

= 16.87%  

= 16.9%

percentage of oxygen  = 5.25 x 100 / 15

= 35 %  

8 0
3 years ago
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