1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Irina18 [472]
3 years ago
13

. Copper(I) oxide, Cu2O, is reduced to metallic copper by heating in a stream of hydrogen gas. What mass of water is produced wh

en 10.00 g copper is formed?
Chemistry
2 answers:
Misha Larkins [42]3 years ago
8 0
<span>The mass of water is produced when 10.00 g copper is </span>0.07868 mol H₂O
Equation:Cu₂O +H₂ → 2Cu + H₂O

Get the mole ratios:1 mol Cu₂O : 1 mol H₂ : 2 mol Cu : 1 mol H₂O
number of moles = 0.1574 molSolve:
2mol Cu           0.1574 mol Cu--------------- =  ---------------------1 mol H₂O                   x
 x = 0.1574 mol Cu × 1 mol H₂O / 2mol Cu
= 0.07868 mol H₂O

maksim [4K]3 years ago
7 0
Answer: 0.07868 mol H₂O

Explanation:

1) Chemical equation:

Cu₂O +H₂ → 2Cu + H₂O

2) mole ratios:

1 mol Cu₂O : 1 mol H₂ : 2 mol Cu : 1 mol H₂O

3) Convert 10.00 g of Cu to grams, using the atomic mass:

Atomic mass of Cu: 63.546 g/mol

number of moles = mass in grams / atomic mass = 10.00g / 63.546 g/mol

number of moles = 0.1574 mol

4) Use proportions

2mol Cu           0.1574 mol Cu
--------------- =  ---------------------
1 mol H₂O                   x

⇒ x = 0.1574 mol Cu × 1 mol H₂O / 2mol Cu = 0.07868 mol H₂O

That is the answer
You might be interested in
A student is performing a titration to determine the concentration of a 20.0 mL sample of hydrochloric acid. What did the studen
irakobra [83]

Answer:

0.25M HCl

Explanation:

The reaction of HCl with NaOH is:

HCl + NaOH ⇄ H₂O + NaCl

<em>Where 1 mole of HCl reacts per mole of NaOH</em>

The end point was reached when the student added:

0.0500L × (0.1mol / L) = 0.00500 moles of NaOH

As 1 mole of HCl reacted per mole of NaOH, moles of HCl present are:

<em>0.00500 moles HCl</em>

The volume of the sample of hydrochloric acid was 20.0mL = 0.0200L, and concentration of the sample is:

0.00500 mol HCl / 0.0200L = <em>0.25M HCl</em>

8 0
3 years ago
Q1. If a piece of ice absorbs 131 J of heat energy, how much was lost by the surroundings?
Rashid [163]

Answer:

53

Explanation:

4 0
3 years ago
Energy and Temperature Activity Worksheet
NeTakaya

Answer:

the ground would heat up slower than the sand because it has lots of moisture  so sand would heat up faster than any thing other than lava

Explanation:

7 0
2 years ago
Read 2 more answers
What is the answer pls help me
scZoUnD [109]
It’s definitely magnesium but it may not be
3 0
3 years ago
The compound Xe(CF3)2 decomposes in afirst-order reaction to elemental Xe with a half-life of 30. min.If you place 7.50 mg of Xe
Irina-Kira [14]

Answer:

t=147.24\ min

Explanation:

Given that:

Half life = 30 min

t_{1/2}=\frac{\ln2}{k}

Where, k is rate constant

So,  

k=\frac{\ln2}{t_{1/2}}

k=\frac{\ln2}{30}\ min^{-1}

The rate constant, k = 0.0231 min⁻¹

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

Where,  

[A_t] is the concentration at time t

[A_0] is the initial concentration

Given that:

The rate constant, k = 0.0231 min⁻¹

Initial concentration [A_0] = 7.50 mg

Final concentration [A_t] = 0.25 mg

Time = ?

Applying in the above equation, we get that:-

0.25=7.50e^{-0.0231\times t}

750e^{-0.0231t}=25

750e^{-0.0231t}=25

x=\frac{\ln \left(30\right)}{0.0231}

t=147.24\ min

6 0
3 years ago
Other questions:
  • What is the net ionic equation for the reaction of aqueous calcium acetate and aqueous sodium carbonate?
    13·1 answer
  • Which of the following is true for the equilibrium constant of a reaction? It is a ratio of the concentrations in a reaction. It
    15·1 answer
  • What is the theoretical yield of bromobenzene in this reaction when 32.0 g of benzene reacts with 69.3 g of bromine?
    12·1 answer
  • Which element(s) are not balanced in this equation?
    15·2 answers
  • In 1909, Ernest Rutherford performed an experiment to explore the atomic structure. In his experiment, he projected high-speed α
    7·1 answer
  • What's changed into alcohol while in brew​
    11·1 answer
  • How must the hydrogen in an acid be attached (ionically or covalently) to be an acid?
    13·1 answer
  • What force is necessary to accelerate a 1,200 kg car at a rate of 35 m/s2?
    13·1 answer
  • Story that ends with I suddenly wake up and realize that it was a dream​
    12·1 answer
  • Plz help, asap, no links and don't put answer if you don't know. Explain also!
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!