Answer: 1.99 x 10²² molecules H2
Explanation:First we will solve for the moles of H2 using Ideal gas law PV= nRT then derive for moles ( n ).
At STP, pressure is equal to 1 atm and Temperature is 273 K.
Convert volume in mL to L:
750 mL x 1 L / 1000 mL
= 0.75 mL
n = PV/ RT
= 1 atm ( 0.75 L ) / 0.0821 L.atm/ mole.K ( 273 K)
= 3.3x10-² moles H2
Convert moles of H2 to atoms using Avogadro's Number.
3.3x10-² moles H2/ 6.022x10²³ atoms H2 / 1 mole H2
= 1.99x10²² atoms H2
Answer: The correct answer is crude oil is a mixture of many organic compounds that need to be isolated to be used.
Explanation:
Crude oil is a naturally occurring petroleum product which is unrefined. It consists of various hydrocarbon deposits and organic compounds.
The refining of crude oil is important because it yield some important compounds that can be used in various purposes.
The refining of crude oil produces products such as gasoline, petrol, diesel and various other forms of petrochemicals which can be used on daily basis.
Hence, the correct statement is crude oil is a mixture of many organic compounds that need to be isolated to be used.
Answer:
Increases in the frequency of intense rainfall,
Decreases in snow cover and sea ice,
More frequent and intense heat waves,
Rising sea levels, and.
Widespread ocean acidification.
Explanation: