Na2SO4 is the salt that is produced.
If you look at the question, it asking which is produced so the answer must be on the product side of the reaction (to the right of the arrow).
You should also recognize that 2H2O is water, and water is not a salt.
Therefore the only other choice is Na2SO4.
1) The equation is already balanced;
Left side: 1C, 2H and 1O
Right side: 1C, 1O, 2H
2) Starting substances: water and carbon
There are two starting substances also called reactants. H2O which is a compound and C which is an element.
3) Ending substance asked for: H2.
This is hydrogen gas.
Stoichiometry:
1 mol of C produces 1 mol of H2
12.01 g of C productes 2.016 grams of H2
Ratio: 2.016 g of H2 / 12.01 g of C = X g of H2 / 34 g of C =>
x = 34 g of C* 2.016 g of H2 / 12.01 g of C= 5.707 g of H2
Madison Boulder is made of fine-grained feldspar and larger quartz crystals that welled up under great pressures from a molten mass deep in the earth over 200 million years ago. Upon cooling, the molten rock hardened. Over the millions of intervening years softer materials on the earth's surface were removed by erosion from wind and water. Not so with the granite of New Hampshire, the Granite State!
As recently as 1835, geologists believed that huge boulders like Madison Boulder isolated in their surroundings had been washed to their present locations by great floods which are said to have occurred in ancient times. Today, it is believed that these large boulders, or "erratics," were moved various distances during the last ice age.
Most authorities trace Madison Boulder to the Whitton or White ledges 12.5 and 4 miles respectively, to the northwest. However, a few maintain that the boulder so closely resembles one of the four types of rock that form Mount Willard in Crawford Notch, twenty-four miles to the nothwest, that the ice sheet must have brought it from there. Madison Boulder lies on "glacial drift," unsorted sediments left by the retreating ice sheet.
<span>Avogadro's number
represents the number of units in one mole of any substance. This has the value
of 6.022 x 10^23 units / mole. This number can be used to convert the number of
atoms or molecules into number of moles.
12 g CuBr2 ( 1 mol / 223.37 g) ( </span>6.022 x 10^23 molecules / mole ) = 3.24x10^22 molecules CuBr2
<span>Statement A is wrong because all atoms has protons and neutrons in the neucleus except for hydrogen that has only one proton in the neuclues. Statement B is also wrong. Statement C is correct as there exists isotopes which are atoms of the same element wich exist with different number of neutrons.</span>