<em>Transport of substances across cell membrane:</em>
<em>Carrier proteins facilitate transport of material across a membrane by changing its shape to allow a substance to pass through its membrane. It transports substances from high concentration to lower concentration levels.</em>
Answer:
7.1 moles Cl₂
Explanation:
To solve this problem we will use <em>Avogadro's number </em>(Aₙ), which tells us how many molecules (or atoms) are present in 1 mol of any given substance
Aₙ = 6.023 x 10²³ molecules/mol
With that in mind now we proceed to convert molecules into moles:
4.28 x 10²⁴ molecules Cl₂ ÷ 6.023 x 10²³ molecules/mol = 7.1 moles Cl₂
Answer:
See attached picture.
Explanation:
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In this case, by considering that the carbon has four valence electrons as it is in group IVA, sulfur has six valence electrons as it is in group VIA and bromine has seven valence electrons as it is in group VIIA we infer that the carbon is the central atom in CSBr2 so one double bond between carbon and sulfur makes it complete the octet and two carbon-to-bromine bonds are formed in order to complete the octets of both carbon and bromine as shown on the attached picture.
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Copper mass = 1.659
Copper moles = 1.659 / 64 = 0.0259
Sulfur mass = 2.08 - 1.659 = 0.421
Sulfur moles = 0.421 / 32 = 0.0131
Ratio Copper : Sulfur = 2 : 1
Empirical formula: Cu ₂ S
Name: Copper (I) sulfide
