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
horrorfan [7]
3 years ago
13

Hi everyone want me to answer your modules? from grade 7-8

Chemistry
1 answer:
Vlada [557]3 years ago
5 0

Answer:

addd me :)

Explanation:

hehehehehe

You might be interested in
A compound can have different chemical and physical properties than
Marizza181 [45]

Answer: It's true

Explanation:

7 0
3 years ago
What type of compound is calcium oxide
mrs_skeptik [129]
CaO ( calcium oxide) is a basic oxide.


6 0
3 years ago
for the following reaction: 1 CuO + 1 H2 --> 1 Cu +1H2O, what is the quantity of moles of H2O when there are 240 grams of CuO
Ber [7]

Considering the reaction stoichiometry, the quantity of moles of H₂O produced is 3.02 moles.

The balanced reaction is:

CuO + H₂ → Cu + H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:  

  • CuO= 1 mole
  • H₂= 1 mole
  • Cu= 1 mole
  • H₂O= 1 mole

The molar mass of the compounds present in the reaction is:

  • CuO= 79.55 g/mole
  • H₂= 2 g/mole
  • Cu= 63.55 g/mole
  • H₂O: 18 g/mole

Then, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:  

  • CuO= 1 mole× 79.55 g/mole= 79.55 grams
  • H₂= 1 mole× 2 g/mole= 2 grams
  • Cu= 1 mole× 63.55 g/mole= 63.55 grams
  • H₂O: 1 mole× 18 g/mole= 18 grams

Then, it is possible to determine the moles of H₂O necessary by the following rule of three:  If by reaction stoichiometry 79.55 grams of CuO produces 1 mole of H₂O, 240 grams of CuO produces how many moles of H₂O?

molesofH_{2} O=\frac{240 grams of CuOx 1 mole ofH_{2} O }{79.55 grams of CuO}

<u><em>moles of H₂O= 3.02 moles</em></u>

Finally, the quantity of moles of H₂O produced is 3.02 moles.

Learn more:

  • <u>brainly.com/question/11999193 </u>
  • <u>brainly.com/question/15111313?referrer=searchResults </u>
  • <u>brainly.com/question/9926203?referrer=searchResults </u>
  • <u>brainly.com/question/6061451?referrer=searchResults</u>
6 0
3 years ago
How many moles are in 75.0g of Na2CO3
emmasim [6.3K]

Answer:

75g/106g = 0.71 moles

8 0
3 years ago
Need help on #129. Please help!
MrRissso [65]

The percentage yield is 72.8 %.

<em>Step 1</em>. Calculate the <em>mass of Br₂</em>

Mass of Br₂ = 20.0 mL Br₂ × (3.10 g Br₂/1 mL Br₂) = 62.00 g Br₂

<em>Step 2</em>. Calculate the <em>theoretical yield</em>

M_r:           159.81    266.69

         2Al + 3Br₂ → 2AlBr₃

Moles of Br₂ = 62.00 g Br₂ × (1 mol Br₂/(159.81 g Br₂) = 0.3880 mol Br₂

Moles of AlBr₃ = 0.3880 mol Br₂ × (2 mol AlBr₃/(3 mol Br₂) =  0.2586 mol AlBr₃

Theor. yield of AlBr₃ = 0.2586 mol AlBr₃ × 266.99 g AlBr₃)/(1 mol AlBr₃)

= 69.05 g AlCl₃

<em>Step 3</em>. Calculate the <em>percentage yield </em>

% yield = (actual yield/theoretical yield) × 100 % = (50.3 g/69.05 g) × 100 %

= 72.8 %

5 0
3 years ago
Other questions:
  • How many sodium atoms does 2NaOH have?
    9·2 answers
  • Identify the type of reaction described in the sentence below. then, write a chemical equation. be sure to specify the states of
    12·1 answer
  • What is the difference between effusion and diffusion?
    14·1 answer
  • Sodium hydroxide reacts with carbondioxide as follows: 2 naoh(s) + co2 (g) → na2co3 (s) + h2o(l) which reagent is the limiting r
    11·1 answer
  • Is c2h2 polar or non polar?
    9·2 answers
  • What is the goal of technology
    5·2 answers
  • Initially the concentration of H2 is 2.0M , I2 is 2.0M and HI is 8.0M. The vessel is heated up to 675 degrees at equilibrium the
    6·1 answer
  • If 500.0 mL of 0.450 M sodium phosphate is reacted with an excess of iron (II) nitrate solution, how many grams of iron (II) pho
    5·1 answer
  • I need help can someone help me please?
    12·1 answer
  • How many atoms of oxygen are in 30H?<br> 1. 3<br> 2. 4<br> 3. 2<br> 4. 1
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!