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4 years ago

Pls help ill mark as brainliest :)

Chemistry

1 answer:

Alina [70]4 years ago

4 0

Answer:

I think its a double reaction

Explanation:

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How many liters is 1.9 mol of Cl2 at STP?

Lena [83]

Answer:

V = 42.6 L

Explanation:

Given data:

Number of moles of Cl₂ = 1.9 mol

Temperature and pressure = standard

Volume occupy = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K

T = temperature in kelvin

By putting values,

1 atm × V = 1.9 mol ×0.0821 atm.L /mol.K × 273.15 k

V = 42.6 atm.L / 1 atm

V = 42.6 L

8 0

3 years ago

Perform the following mathematical operation and express the results to the correct number of significant figures. (0.102 x 0.08

Kobotan [32]

Answer:

2.26

Explanation:

First you should know what are significant figures,

1 . All non - zero digits are significant.

2 . The zero between two non- zero are significant.Ex 302 has 3 significant figures.

3. The zero before the decimal and before any non-zero digit is non significant. Example : 0.003 has only 1 significant figure.

4. The zero after non zero are non - significant . But the zeros after the decimal point are significant.

300 has only 1 significant figure

300.0 has 4 significant figure

The least number of significant figures present in the number should be there in the final answer of the calculation.

Look at the number having minimum significant digits :

It is 3 (every number has 3- significant figures ) So the answer should also contain 3 - significant figures.

$\frac{0.102\times 0.0821\times 273}{1.01}$

First solve the numerator part

$\frac{2.285}{1.01}$

$=2.2635$

Round off this number to 3 significant figures.

Answer is = 2.26

It has 3 - significant digit since all the digits are non-zero.

5 0

3 years ago

What is the salt produced when calcium hydroxide, Ca(OH)2, reacts with phosphoric acid, H3PO4, in a neutralization reaction?

Pavel [41]

$3Ca(OH) _{2} +2H _{3} PO _{4}$ ⇒ $6H _{2} O+Ca _{3}(PO _{4}) _{2}$
Calcium phosphate. Which is your Ca3(PO4)2.

5 0

3 years ago

Read 2 more answers

[07.03] what is the ph of a 6.40 × 10-3 m solution of sodium hydroxide, naoh?

Katena32 [7]

POH = - log [OH]
pOH = - log (6.40 × 10-3) 
pOH = 2.19 

pH + pOH = 14 

pH = 14 - pOH 
pH = 14 - 2.19 
pH = 11.8

6 0

4 years ago

1. Calculate the number of moles of carbon dioxide formed when 40.0 moles of oxygen is consumed in the burning of propane. Note

Andrews [41]

Answer:

1. D (24.0 moles CO2)

2. A (.239 moles H2)

Explanation:

1. First Balance the equation

1 C3H8 + 5 O2 ---> 3 CO2 + 4 H2O

Then set up a stoiciometric equation so that the moles of O2 cancel out

40mol O2 x $\frac{3 mole CO2}{5 mole O2}$ = 24.0 moles CO2

2. Set up a stoichiometric equation

10 grams Fe x $\frac{1 mole Fe}{55.85 grams Fe}$ x $\frac{4 mole H2}{3 mole Fe}$ = 0.239 moles H2

6 0

3 years ago