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ValentinkaMS [17]
3 years ago
14

How many moles are in 987 grams of : Ra(OH)2

Chemistry
2 answers:
sergejj [24]3 years ago
8 0
Your answer is 3.80 moles
likoan [24]3 years ago
6 0
Here are the molar masses of these atoms:

Ra = 226 g/mol

H = 1.008 g/mol * 2 (there are two hydrogen atoms in radium hydroxide)

O = 15.999 g/mol * 2

The molar mass of radium hydroxide is therefore 260.014 g/mol.

Divide this number by 987 grams to cancel the units in order to obtain the number moles.

260.014 g/mol / 987 g = 0.263 mol
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The analysis of a compound gives the following percent composition by mass:
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Answer:

C15 H31 O4 S

Explanation:

molecular formula is also the same because the value of "n" is 1

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The concentration of pb2+ in a solution saturated with pbbr2(s) is 2.14 ✕ 10-2 m. calculate ksp for pbbr2.
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Concentration = 2.14 âś• 10-2 m 
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3 0
3 years ago
Read 2 more answers
Calculate the percent by mass of a solution of Ca(NO3)2 that has 22.63 g dissolved in 896.92 g of water.
never [62]

Hey there!

To calculate the percent by mass of the Ca(NO₃)₂ we need to find the total mass first by adding.

896.92 + 22.63 = 919.55

In total, the solution is 919.55 grams.

To find the percent of Ca(NO₃)₂ in the solution, divide the mass of Ca(NO₃)₂ by the total mass and multiply by 100.

22.63 ÷ 919.55 = 0.0246

0.0246 x 100 = 2.46

Ca(NO₃)₂ makes up 2.46% of the solution.

Hope this helps!

6 0
3 years ago
The atomic mass is the sum of the number of ________ and ________ in the nucleus of an atom. Choose two answers from the options
iVinArrow [24]

Answer :

The atomic mass is the sum of the number of protons and neutrons in the nucleus of an atom.

Explanation :

Atomic number : it is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Mass number or atomic mass : It is defined as the sum of the number of protons and the number of neutrons.

Mass number or atomic mass = Number of protons + Number of neutrons

For example :

Number of protons in carbon = 6

Number of neutrons in carbon = 6

Mass number or atomic mass = Number of protons + Number of neutrons

Mass number or atomic mass = 6 + 6

Mass number or atomic mass = 12

Thus, the atomic mass is the sum of the number of protons and neutrons in the nucleus of an atom.

3 0
3 years ago
Read 2 more answers
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