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Troyanec [42]
3 years ago
10

11. A certain gas takes three times as long to effuse out

Chemistry
1 answer:
gladu [14]3 years ago
8 0

answer is 36 u 2 one okkkkkkk

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How many grams of Chromium(III) nitrate are produced when Chromium reacts with 0.85 moles of Lead(IV) nitrate to produce chromiu
mina [271]

Grams of Chromium(III) nitrate produced : 268.95 g

<h3>Further explanation</h3>

Given

0.85 moles of Lead(IV) nitrate

Required

grams of Chromium(III) nitrate

Solution

Reaction

Balanced equation :

<em>2Cr₂ + 3Pb(NO₃)₄ ⇒ 4Cr(NO₃)₃ + 3Pb </em>

From the equation, mol ratio of Pb(NO₃)₄  : Cr(NO₃)₃ = 3 : 4, so mol Cr(NO₃)₃

mol Cr(NO₃)₃ =

\tt \dfrac{4}{3}\times 0.85=1.13

Mass of Chromium(III) nitrate (MW=238.0108 g/mol) :

mass = mol x MW

mass = 1.13 x 238.0108

mass = 268.95 g

7 0
3 years ago
Dilute solutions of NaHCO3 are sometimes used in treating acid burns.
Temka [501]

Answer:

We need 375 milliliters of 0.100 M NaHCO3 solution

Explanation:

Step 1: Data given

Initial molarity NaHCO3 = 0.100 M

Volume prepared solution = 750.0 mL

Molarity prepared solution = 0.05 M

Step 2: Calculate initial volume

C1*V1 = C2V2

⇒with C1 = the initial concentration = 0.100 M

⇒with V1 = The initial volume = TO BE DETERMINED

⇒with C2 = the new concentration = 0.0500M

⇒with v2 = the new volume = 750.0 mL = 0.750 L

0.100 M * V1 = 0.0500 M * 0.750 L

V1 = (0.0500M * 0.750L)/0.100 M

V1 = 0.375 L = 375 mL

We need 375 milliliters of 0.100 M NaHCO3 solution

8 0
3 years ago
What is the name of the functional group that is attached to this hydrocarbon? The first and last of a chain of three carbons ar
vova2212 [387]

Answer:

Ketone

Explanation:

According to the description of the functional group attached to the hydrocarbon - the first and last of a chain of three carbons are each single bonded to 3 hydrogen (H)atoms; the center carbon is double bonded to an oxygen atom, O - it can be deduced that the functional group is a ketone group.

A ketone is a functional group with the structure R₂-C=O, where the two R are  alkyl or phenyl groups which may be the same or different. The carbon in a double covalent bond with oxygen is called the carbonyl carbon. The two R groups are bonded to the carbonyl carbon in single covalent bonds.

In the hydrocarbon in this question, the two R groups are methyl groups, CH₃ bonded to the carbonyl carbon. The name of the hydrocarbon is propanone and it is a ketone molecule.

4 0
3 years ago
Read 2 more answers
Please help on my science not sure what to put it under but here's the picture
Sergio [31]

Answer:

How we can use images to promote and communicate science ... the cliché, “a picture tells a thousand words”, but there is real value in ... Images help us learn, images grab attention, images explain tough ... at BioMed Central, one thing I've realised is how vital images are in my role. ... Here's an example:.

Explanation:

5 0
3 years ago
Q # 1 For chemical reaction ,please help
horrorfan [7]

Answer:- d)  42 kJ of heat is released and the reaction is exothermic.

Solution:- Heat of reaction is the summation of heats of products - reactants.

\Delta H_r_x_n=\sum [products-reactants]

From given information, the energy contained by products is 352 kJ and the energy contained by reactants is 394 kJ. Let's plug in the values in the formula:

\Delta H_r_x_n  = [352 kJ - 394 kJ]

\Delta H_r_x_n  = -42 kJ

Heat of reaction is -42 kJ. The negative sign indicates the heat is released means the reaction is exothermic.  

So, the correct option is the last one, 42 kJ of heat is released and the reaction is exothermic.

5 0
3 years ago
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