The number of grams is 10
I think it is d it is definitely not a or b
Both mile and yard are units of distance thus they are inter convertible.
Distance covered in a marathon is 26.2 miles.
Since, 1 mile=1760 yards
Thus, distance can be converted into yards using the following conversion factor:
Thus, distance covered in marathon in yard will be:
Therefore, distance of the race is 46112 yards.
From other sources, the given mass of the solute that is being dissolved here is 7.15 g Na2CO3 - 10H2O. We use this amount to convert it to moles of Na2CO3 by converting it to moles using the molar mass then relating the ratio of the unhydrated salt with the number of water molecules. And by the dissociation of the unhydrated salt in the solution, we can calculate the moles of Na+ ions that are present in the solution.
Na2CO3 = 2Na+ + CO3^2-
7.15 g Na2CO3 - 10H2O (1 mol / 402.9319 g) (1 mol Na2CO3 / 1 mol Na2CO3 - 10H2O) ( 1 mol Na2CO3 / 1 mol Na2CO3-10H2O ) ( 2 mol Na+ / 1 mol Na2CO3) = 0.04 mol Na+ ions present
