There are about 1 760 000 000 000 000 000 000 molecules of sucrose in 1 g of table sugar. Expressed in scientific notation, what is the number of molecules in 1 g of sugar? A) 1.76 x 10-22 B) 1.76 x 10-20 C) 1.76 x 1021 D) 1.76 x 1022
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Answer:
The correct answer is option c.
Explanation:
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Let's solve this!
To write a number in scientific notation, we look for a number between zero and nine. Then we count the number of times we ran the point to reach that number. If we run the point to the right, the exponent is negative. If we run the point to the left, the exponent is positive.
In this case the number is: 1 760 000 000 000 000 000 000
We choose the number 1.76
We run the point 21 times to the left, so the exponent is positive.
The solution is
The correct answer is option c.
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A droplet of pure mercury has a density of 13.6 g/cm^3. What is the density of a sample of pure mercury that is 10 times as large as the droplet?
Answers
2HBr(aq) Ba(OH)2 (aq) = 2H2O (l) BaBr2(aq)
Ionic equation
2H 2Br- Ba 2 2OH- --------> Ba 2 2Br - 2H2O
Net ionic equation
2H (aq) 2OH- (aq)- ---------> 2H2O (l)
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Answer:
Explanation:
The molar mass is the mass of a substance in grams per mole.
To find it, add the mass of each element in the compound. These masses can be found on the Periodic Table.
The compound given is:
The compound has 1 Ca (calcium) and 2 Cl (chlorine).
Mass of Calcium
- The molar mass of calcium is 40.08 g/mol
- There is only one atom of Calcium in CaCl₂, so the number above is what we will use.
Mass of Chlorine
- The molar mass of chlorine is 35.45 g/mol
- There are two atoms of chlorine in CaCl₂, therefore we need to multiply the molar mass by 2.
- 35.45 * 2= 70.9 g/mol
Molar Mass of CaCl₂
- Now, to find the molar mass, add the molar mass of 1 calcium and 2 chlorine.
- 40.08 g/mol + 70.9 g/mol =110.98 g/mol
The molar mass of CaCl₂ is 110.98 grams per mole.
Copper (II)iodide
Tin(IV) nitride
Choro minim (II)bromide
Iron(III)phosphide
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Nickel(III)oxide: binary, Ni2O3
Copper (II)iodide: binary, CuI2
Tin(IV) nitride: binary, Sn3N4
Chromium (II)bromide: binary, CrBr2
Iron(III)phosphide: binary, FeP
Final answer:
Compounds are classified as binary or ternary based on the number of elements present in the compound. The chemical formulas for the given compounds include nickel(III)oxide, copper(II)iodide, tin(IV)nitride, chloro minimium(II)bromide, and iron(III)phosphide.
Explanation:
In order to identify whether a compound is binary or ternary, we need to analyze its chemical formula. Binary compounds consist of two elements, while ternary compounds consist of three or more elements. The chemical formula for each compound is as follows:
- Nickel(III)oxide - ternary compound
- Copper(II)iodide - binary compound
- Tin(IV)nitride - ternary compound
- Chloro minium(II)bromide - ternary compound
- Iron(III)phosphide - ternary compound
Learn more about Classification of Compounds here:
#SPJ2
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1 mole ----------> 99.424 g
mole ----------> 0.9876 g
mole = 0.9876 / 99.424
= 0.00993 moles of Zn(OH)2
1 mole ------------> 6.02x10²³
0.00993 ----------> units
units = 0.00993 * 6.02x10²³
= 5.977x10^21 formula units.
hope this helps!.