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9966 [12]
4 years ago
5

"what percentage of the solar nebula's mass consisted of elements besides hydrogen and helium gases?"

Chemistry
1 answer:
Alborosie4 years ago
6 0
Your answer would be 2%

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What is the molality of an aqueous solution that contains 29.5 g of glucose (C6H12O6) dissolved in 950 g of water (H2O)?
Gnesinka [82]
Molality is one way of expressing concentration of a solute in a solution. It is expressed as the mole of solute per kilogram of the solvent. To calculate for the molality of the given solution, we need to convert the mass of solute into moles and divide it to the mass of the solvent.

Molality = 29.5 g glucose (1 mol / 180.16 g ) / .950 kg water
Molality = 0.1724 mol / kg
7 0
3 years ago
Question 1 (4 points)
Vilka [71]
To be honest answer might be a
7 0
3 years ago
A length of copper wire has a mass of 6.19 g. How many moles of copper are in the wire? moles​
zhannawk [14.2K]

Answer:

molar mass of copper = 63.55 g/mol

( <u>1</u><u> </u><u>mol </u><u>of </u><u>copper)</u>

6.19 g copper × ( 63.55g copper )

0.0975 moles

6 0
3 years ago
A sample of an unknown compound is vaporized at 180.°C. The gas produced has a volume of 2010.mL at a pressure of 1.00atm, and i
stiv31 [10]

<u>Answer:</u> The molar mass of the given unknown compound is 50.5 g/mol.

<u>Explanation:</u>

To calculate the volume of water, we use the equation given by ideal gas, which is:

PV=nRT

or,

PV=\frac{m}{M}RT

where,

P = pressure of sample = 1.00 atm

V = volume of sample = 2010 mL = 2.010 L   (Conversion factor: 1 L = 1000 mL)

m = Given mass of unknown compound = 2.73 g

M = Molar mass of unknown compound = ? g/mol

R = Gas constant = 0.0820\text{ L atm }mol^{-1}K^{-1}

T = temperature of sample = 180^oC=[180+273]K=453K

Putting values in above equation, we get:

1.00atm\times 2.010L=\frac{2.73g}{M}\times 0.0820\text{ L atm }mol^{-1}K^{-1}\times 453K\\\\V=50.45g/mol

Rounding off to 3 significant figures, we get the molar mass to be 50.5 g/mol.

Hence, the molar mass of the given unknown compound is 50.5 g/mol.

8 0
3 years ago
Four atoms have the numbers of protons and neutrons given below.
Makovka662 [10]

Answer:

W and X

Explanation:

isotopes : are masses of atoms with the same number of proton and electron but different neutron .

W and X have the same number of protons and different number of neutrons.

3 0
3 years ago
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