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
SVETLANKA909090 [29]
3 years ago
5

An empty beaker weighs 34.55 g.

Chemistry
1 answer:
Margaret [11]3 years ago
3 0

Answer:

a. 406.3mL

b. 5519.6g

Explanation:Please see attachment for explanation

You might be interested in
This reaction is sometimes used to inflate life rafts, weather balloons, and the like, where a simple, compact means of generati
tia_tia [17]

Answer: 10.2 grams

Explanation:

The balanced chemical reaction is :

CaH_2(s)+2H_2O(l)\rightarrow Ca(OH)_2(aq)+2H_2(g)

According to the ideal gas equation:

PV=nRT

P = Pressure of the gas = 740 torr =  0.97 atm    (760torr=1atm)

V= Volume of the gas = 12.0 L

T= Temperature of the gas = 19°C = 292 K    0^0C=273K

R= Gas constant = 0.0821 atmL/K mol

n= moles of gas

n=\frac{PV}{RT}=\frac{0.97\times 12.0}{0.0821\times 292}

n=0.48

According to stoichiometry:

2 moles of hydrogen are generated by = 1 mole of CaH_2

Thus 0.48 moles of hydrogen are generated by =\frac{1}{2}\times 0.48=0.24 moles of CaH_2

Mass of  CaH_2=moles\times {\text {Molar mass}}=0.24mol\times 42g/mol=10.2g

Thus 10.2 grams of CaH_2 are needed to generate 12.0 L of hydrogen gas if the pressure of hydrogen is 740. torr at 19°C

5 0
3 years ago
Identify each description as either a physical or chemical change.
Anettt [7]

Answer:

1 - physical

2 -chemical

3 - chemical

4 - physical

5 - physical

6 - chemical

7 - physical

8 - chemical

4 0
3 years ago
The heat from the bonfire is transferred to the student's hands through the process of
Agata [3.3K]

Answer:

Radiation

Explanation:

3 0
2 years ago
This is how fluorine appears in the periodic table. A green box has F at the center and 9 above. Below it says fluorine and belo
Oksana_A [137]
1. Atomic weight of fluorine

2. Number of proton and neutrons found in the nucleus of the element

3. And every number uniquely identifies each of the the elements
8 0
3 years ago
1. Balance this reaction: Fe2O3(s) + C(s) → Fe(s) + CO2(g)
MA_775_DIABLO [31]
<span>2Fe2O3(s) + 3C(s) →4 Fe(s) + 3CO2(g)
                       3 mol                      3mol
                       4 mol                      x mol
x=4*3/3= 4.0 mol

</span>2Fe2O3(s) + 3C(s) →4 Fe(s) + 3CO2(g)<span>
2 mol              3 mol
14 mol            x mol

x=14*3/2= 21.0 mol</span>
4 0
3 years ago
Other questions:
  • A solution contains 0.750 g of mg2 in enough water to make a 1875 ml solution. what is the milliequivalents of mg2 per liter (me
    9·1 answer
  • Fe2O3(s) + 3CO(
    9·1 answer
  • How many grams of oxygen are required to react with 12.0 grams of octane in the combustion of octane in gasoline?
    13·1 answer
  • All matter has __. A.) COLOR B.) MASS C.) VOLUME D.) WEIGHT
    12·1 answer
  • Please help!
    7·1 answer
  • Consider the decomposition of a metal oxide to its elements where m represents a generic metal. m3o4
    5·1 answer
  • Imm so bored talk to meeeee tehee freeee pointsss
    15·2 answers
  • Express the following numbers in Standard Form:
    13·1 answer
  • Can someone please help!! I’m in a test!!
    7·1 answer
  • How can speed be described?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!