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ella [17]
3 years ago
7

What is the answer please help

Chemistry
2 answers:
Wewaii [24]3 years ago
6 0

Answer: C

Explanation:

there should be 2 molecules which leaves A and C. But there should be 1 white circle and 3 black circles which means C is the right answer

Helen [10]3 years ago
5 0
The answer to your question is C
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Calculate the atomic mass for copper using the weighted average mass method. Express your answer using two decimal places and in
tatuchka [14]

Answer:

63. 55 amu

Explanation:

Copper is known to exist in two different isotopes which are Cu-63 and Cu-65.

Cu-63 has an atomic mass of 62.93 amu and it has an abundance of 69.15%.

Similarly,

Cu-65 has an atomic mass of 64.93 amu and it has an abundance of 30.85%

Therefore, using the weighted average mass method, the atomic mass of copper is:

Atomic mass of copper = (0.6915*62.93) amu + (0.3085*64.93) amu = 43.52 amu + 20.03 amu = 63.55 amu

Thus, the atomic mass of copper (express in two decimal places) is 63.55 amu

8 0
3 years ago
A solution was made by dissolving 5.10 mg of hemoglobin in water to give a final volume of 1.00 ml. the osmotic pressure of this
Assoli18 [71]

The molecular weight of hemoglobin can be calculated using osmotic pressure

Osmotic pressure is a colligative property and it depends on molarity as

πV = nRT

where

π = osmotic pressure

V = volume = 1mL = 0.001 L

n = moles

R = gas constant = 0.0821 L atm / mol K

T = temperature = 25°C = 25 + 273 K = 298 K

Putting values we will get value of moles

moles=\frac{\pi V}{RT}=\frac{0.00195X0.001}{0.0821X298}mol

we know that

moles=\frac{mass}{molarmass}

Therefore

molarmass=\frac{mass}{moles}=\frac{5.10X10^{-3}g}{7.97X10^{-8}}=6.399X10^{4}g

5 0
2 years ago
PLEASE HELP IMMEDIATE WORTH 10 POINTS
Otrada [13]

Answer:

the scientific name is Angiosperms

Explanation:

please mark brainliest

8 0
3 years ago
Help me please, will give brainly
geniusboy [140]

I don’t know sorry :(
6 0
3 years ago
Read 2 more answers
Which has more energy, low or high frequency electromagnetic radiation?
hammer [34]
Energy increases with increasing frequency. 
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3 years ago
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