The MC1R gene provides instructions for making a protein called the melanocortin 1 receptor. This receptor plays an important role in normal pigmentation. The receptor is primarily located on the surface of melanocytes, which are specialized cells that produce a pigment called melanin.
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Answer:</h3>
1.926 g of NaOH
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Explanation:</h3>
Concept tested: Mole and Avogadro's number
- We need to know that , 1 mole of a compound contains number of molecules equivalent to the Avogadro's number.
- Th Avogadro's number is 6.022 × 10^23
Therefore;
- 1 mole of a compound = 6.022 × 10^23 molecules
In this case; Our compound is NaOH
Therefore;
1 mole of NaOH contains 6.022 × 10^23 molecules
But; Molar mass of NaOH is 40.0 g/mol
Therefore;
- 40.0 g of NaOH contains 6.022 × 10^23 molecules
With this we can calculate the mass of 2.90 × 10^22 molecules
- Mass of a compound = (number of molecules ÷ Avogadro's constant) × molar mass
Therefore;
Mass of NaOH =(2.90 × 10^22 molecules ÷ 6.022 × 10^23 molecules)40g
= 1.9263 g
= 1.926 g NaOH
Thus, the mass of NaOH is 1.926 g
I think it’s called Gaseous state or water vapor
Explanation:
Three factors that affect the rate of a chemical reaction
are listed below:
1.presence/absence of catalyst
2.temperature
3.nature of reactants
HOPE THIS WILL HELP U
Thank you for posting you question here. I think the question is incomplete. I manage to check the complete question elsewhere:
A 0.0075 V/m electric field creates a 3.9 mA current in a 1.0 mm diameter wire. What is the wire made of?
<span>a) Aluminum (resistivity: 2.82 * 10 ^ -8) </span>
<span>b) Nichrome (resistivity: 1.1 * 10 ^ -6) </span>
<span>c) Copper (resistivity: 1.68 * 10 ^ -8) </span>
<span>d) Iron (resistivity: 1.0 * 10 ^ -7)
</span>
the answer is B which is Nichrome (resistivity: 1.1 * 10 ^ -6)
