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allsm [11]
3 years ago
14

Please help its a grade!!!!!!!!!!!!

Biology
1 answer:
lakkis [162]3 years ago
6 0

First is the second and the other one is the 4th
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you are a biochemist working for a pharmaceutical company. you have been tasked with identifying a sample of nucleic acid. it is
Lorico [155]

The sample that is being discussed in the problem can be either DNA or RNA.

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6 0
1 year ago
Calcule la molalidad de una<br> 20g Ca Cl₂ en 250g de<br> que contiene<br> solucion<br> H₂O.
ahrayia [7]

Answer:

The solution is 0, 90 molal. See the explanation below, please

Explanation:

Molality is defined as moles of solute in 1 kg of solvent (1000 grams). The following three simple rule must be performed:

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Weight Ca =40, 078 g

Weight Cl= 35, 453 g

Weight of 1 mol of CaCl2=40, 078g + 2x (35, 453g )= 110, 98g

110, 98 g ---1 mol

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250g solvent -----0,23 mol CaCl2 (the solute)

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The solution is 0,90 molal

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3 years ago
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Most of the world's freshwater supply is used for:____.
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