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jarptica [38.1K]
3 years ago
10

How many grams of AgNO3 are needed to make 250 ml of a solution that is 0.135 M

Chemistry
1 answer:
myrzilka [38]3 years ago
5 0

Answer:

( About ) 5.7 grams

Explanation:

Take a look at the attachment below for a proper explanation;

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A 5L sample of CO2 at 540 torr and 25 degrees celsius expands to 15L at 32 degrees celsius. What is the pressure of the new cont
saw5 [17]
By  use  of  combined  gas  law
 P2=  T2P1V1/V2
v1=5L
P1=540  torr
T1=25+273=298k
V2=15 L
T2=32+273=305  k

P2  is   therefore=(  305k  x  540 torr  x5 L) /( 15L  x  298)=  184.23  torr
6 0
3 years ago
3.Write the symbol of the element that has a charge of +1 when it has 71 electrons.​
tigry1 [53]

The symbol : \tt _{72}^{178}Hf^{+1}

<h3>Further explanation </h3>

There are two components that accompany an element, the mass number and atomic number

Atoms are composed of 3 types of basic particles (subatomic particles): <em>protons, electrons, and neutrons </em>

The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.

Atomic number = number of protons = number of electrons ⇒ neutral number

Atomic mass is the sum of protons and neutrons

Atomic Number (Z) = Atomic mass (A) - Number of Neutrons

The element has 71 electrons and a charge of +1 , so

Number of protons = 71 + 1 = 72

Number of protons = the atomic number = 72

The element with atomic number 72 is Hafnium(Hf)

The atomic mass of Hf = 178 g/mol

4 0
2 years ago
A helium balloon can hold about 6.8 mol of the gas. Assuming the balloon is kept at room temperature (25°C) and had a maximum of
Kipish [7]

Answer:

P= 138.6 atm or 1.4x10²

Explanation:

You will need to use PV=nRT to solve for P, pressure

Where the R constant is  0.08206 L atm mol^-1 K^-1

V is 1.2 L

T is temperature in kelvin, 273.15+25= 298.15

n is 6.8 mol

P*1.2=6.8*0.08206*298.15 ---> P*1.2=166.3700852 ---> P=166.3700852/1.2

P=138.6 atm

or 1.4x10²

6 0
2 years ago
Read 2 more answers
Molten zinc chloride can be electrolysed.
Crank

Answer: The products of electrolysis are Zn(l) and Cl_2 gas

Explanation:

Electrolysis of a subastance is breaking it into its constituents by the action of electrical current.  

In the electrolysis of molten zinc chloride, zinc metal is produced at the cathode which is a negative electrode and chlorine gas produces as the anode which is a positive electrode.

ZnCl_2(l)\rightarrow Zn^{2+}+2Cl^-

At anode : 2Cl^-(l)\rightarrow 2e^-+Cl_2(g)

At cathode : Zn^{2+}(l)+2e^-\rightarrow Zn(l)

5 0
2 years ago
Molar mass of osmium
lidiya [134]

Answer:-

190.23 gram mol-1

Explanation:-

Molar mass is the mass of 1 mole of that substance. It's unit is gram / mol or gram mol-1.

For an element it is equal to it's atomic weight.

The atomic weight of Osmium is 190.23

Hence the molar mass of Osmium is 190.23 gram / mol

7 0
3 years ago
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