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2 years ago

8

An ice cube melts and then the liquid water evaporates. Which statement is true about the mass of water that goes through each c

hange of state?

1 answer:

s344n2d4d5 [400]2 years ago

5 0

Answer:

it changes.

Explanation:

when in solid form it has an amount of mass. but when evaporated, water is pretty much massless.

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1. Calculate how many moles of glycine are in a 130.0-g sample of glycine.2. Calculate the percent nitrogen by mass in glycine.

Alexxx [7]

Answer:

$n=1.732mol$

$\% N=18.7\%$

Explanation:

Hello!

In this case, since the molecular formula of glycine is C₂H₅NO₂, we realize that the molar mass is 75.07 g/mol; thus, the moles in 130.0 g of glycine are:

$n=130.0g*\frac{1mol}{75.07 g}\\\\ n=1.732mol$

Furthermore, we can notice 75.07 grams of glycine contains 14.01 grams of nitrogen; thus, the percent nitrogen turns out:

$\% N=\frac{14.01}{75.07}*100\% \\\\\% N=18.7\%$

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3 years ago

How to economically produce fine greens

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