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
Paha777 [63]
3 years ago
12

using the equation 2H2+O2-->2H2O,if 192g of water are produced ,how many grams of hydrogen must react with it

Chemistry
1 answer:
Sveta_85 [38]3 years ago
7 0
Based on the given chemical reaction, it can be said that the equation is balanced. To get the amount of Hydrogen needed, back calculation can be done. From 192 g of water, it can be related to its molar mass to convert to the amount of mol. Based on the equation, 1 mol of H2 is equivalent to 2 mol water, by this the amount of H2 needed can be calculated by multiplying to the molar mass (18 g/mol). Below is the calculation:
192 g H2O*(1 mol H2O/18 g H2O)(1 mol H2/2 mol H2O)*(2 g H2/1 mol H2) = 10.67 g H2
You might be interested in
It took 55 days for a radioactivity of 1.75 x 1012 Bq to remain 0.135 Ci. What is the half-life of this radioactivity?
Mnenie [13.5K]

From the calculations, the half life of the material is 6.5 days.

<h3>What is radioactivity?</h3>

The term radioactivity has to do with the spontaneous disintegration of a specie.

Uisng the formula;

N=Noe^-kt

N= amount at time t = 0.135 Ci or 4.995 ×10^9 Bq

No = amount initially present =  1.75 x 10^12 Bq

k = rate constant = ?

t = time taken = 55 days

Hence;

4.995 ×10^9  = 1.75 x 10^12e^-55k

4.995 ×10^9/1.75 x 10^12 = e^-55k

2.85 * 10^-3 = e^-55k

ln2.85 * 10^-3 = -55k

k = ln2.85 * 10^-3/-55

k = 0.1066 day-1

Half life = 0.693/ 0.1066 day-1

= 6.5 days

Learn more about radioactivity:brainly.com/question/1770619

#SPJ1

4 0
1 year ago
Which best describes an element?
Aleonysh [2.5K]

I think the answer is a pure substance

6 0
3 years ago
HNO3 + H2SO4 + NO
77julia77 [94]

Explanation:

The two half equations are;

3e + HNO3 → NO

S→ H2SO4 + 6e

When balancing half equations, we have to make sure the number of electrons gained is equal to the number of electrons lost.

<em>Which factor will you use for the top equation?</em>

We multiply by 2 to make the number of electrons =  6e

<em>Which factor will you use for the bottom equation?</em>

We multiply by 1 to make the number of electrons = 6e

3 0
2 years ago
The diagram shows the potential energy changes for a reaction pathway.
Nitella [24]

1) To find the change in enthalpy, determine the difference between the potential energy of the products and the potential energy of the reactants. (on this diagram, C-A) To find the activation energy, find the difference between the potential energy of the reactants and the "peak" of the curve (on this diagram, B-A). For this diagram, both the enthalpy and activation energy are positive.

2) If the reaction was exothermic, enthalpy would be negative, and the potential energy of the reactants would be greater than the potential energy of the products.

3 0
2 years ago
What would be the best way to measure the volume of a small ?​
WITCHER [35]
You can use a graduated cylinder.
6 0
2 years ago
Other questions:
  • How easily one thing one thing dissolved into another defined what term? A)elasticity B)solubility C)malleability D)conductivity
    14·2 answers
  • What are some physical properties of metals?
    15·2 answers
  • How many independent variables can be tested in a standard scientific experiment
    10·1 answer
  • A buffer of pH 9.24 is to be prepared from a weak acid and its salt. The best acid from which to prepare the buffer is
    12·1 answer
  • Round to 4 significant figures.<br> 35.5450
    5·2 answers
  • 10.How do you make sure there is no cross contamination of your samples of<br> substances?
    15·1 answer
  • How much heat is absorbed/released when 20.00 g of NH3(g) (17.0307g/mol) react in the presence of excess O2(g) to produce NO(g)
    14·1 answer
  • sedimentary rocks that are formed from physical/chemical process within the earth are given the general name of
    9·2 answers
  • In cells, ATP temporarily stores
    7·2 answers
  • Calculate the change in temperature of the water in the calorimeter​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!