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3 years ago

What is the mass (in mg) of 2.63 moles of nickel?

1 answer:

8 0

Data:
Molar Mass of Nickel = 58,7 g/mol

Solving:
58,7 g → 1 mol
y -------→ 2.63 mol

Solving: (They are proportional measures, the rule of three is made (directly proportional)

$\frac{58.7}{y} = \frac{1}{2.63}$
multiply cross
$1*y = 58.7*2.63$
$y = 154.381\:g \stackrel{converting}{\longrightarrow}\:\boxed{y = 154381\:mg}$

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A sample of a compound is analyzed and found to contain 0.420 g nitrogen, 0.480g oxygen, 0.540 g carbon and 0.135 g hydrogen. Wh

RSB [31]

Answer:

C2H5NO

Explanation:

constituent elements N O C H

Mass composition 0.420 0.480 0.540 0.135

mole ratio 0.42/14 0.48/16 0.54/12 0.135/1

= 0.03 0.03 0.045 0.135

dividing by the smallest 0.03/0.03 0.03/0.03 0.045/0.03 0.135/0.03

ratio = 1 1 1.5 4.5

= 1 1 2 5

EMPERICAL FORMULA = C2H5NO

7 0

3 years ago

Which statement is FALSE? a. ΔHrxn is the heat of reaction. b. ΔErxn is a measure of heat. c. An exothermic reaction gives heat

Pavlova-9 [17]

Answer:

b. ΔE rxn is a measure of heat

Explanation:

a. ΔHrxn is the heat of reaction. TRUE. ΔHrxn or change in enthalpy of reaction is per definition the change in heat that is involved in a chemical reaction.

b. ΔErxn is a measure of heat. FALSE. Is the change in internal energy of a reaction

c. An exothermic reaction gives heat off heat to the surroundings. TRUE. An exothermic reaction is a chemical reaction that releases heat.

d. Endothermic has a positive ΔH. TRUE. When a process is exothermic ΔH<0 and when the process is endothermic ΔH>0

e. Enthalpy is the sum of a system's internal energy and the product of pressure and volume. TRUE. Under constant pressure and volume the formula is ΔH = ΔE + PV

I hope it helps!

3 0

3 years ago

The pKa of the α‑carboxyl group of serine is 2.21 , and the pKa of its α‑amino group is 9.15 . Calculate the average net charge

sleet_krkn [62]

Answer:

Net charge in serine at pH equal to 8.30 is "0"

Explanation:

At pH > $pK_{a}$ , carboxyl group exists as $-CO_{2}^{-}$ (charged)

At pH < $pK_{a}$ , carboxyl group exists as -COOH (neutral)
At pH > $pK_{a}$ , amino group exists as $-NH_{2}$ (neutral)
At pH < $pK_{a}$ , amino group exists as $-NH_{3}^{+}$ (charged)
So, at pH = 8.30, both carboxyl and amino group exists in charged state.
Net charge in serine at pH equal to 8.30 is "0".
Structure of serine at pH equal to 8.30 has been shown below.

8 0

4 years ago

Which units represent destiny? Select all that apply.

ozzi

The basic units for density is $\frac{mass}{volume}$ and any get of units that has those units in the proper place can be considered a density unit. The ones that has those specifically are A, B, E and F

7 0

3 years ago

Read 2 more answers

6.02 Ionic and covalent bonds.

Ivan

Convalent Bond energy is low

3 0

4 years ago