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3 years ago

What are the units of molar mass? O A. Lig O B. g/mol O c. g/L O D. mol/g

Chemistry

2 answers:

arlik [135]3 years ago

6 0

Molar mass units is g mol (B)

Lorico [155]3 years ago

4 0

The units of molar mass is g/mol that is the letter B.

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Some velomobile seats have been designed to hold ice packs inside their cushions. If you started a ride with ice packs that held

Cerrena [4.2K]

Answer : The heat energy absorbed will be, $1.23\times 10^5cal$

Solution :

The process involved in this problem are :

$(1):H_2O(s)(0^oC)\rightarrow H_2O(l)(0^oC)\\\\(2):H_2O(l)(0^oC)\rightarrow H_2O(l)(32.0^oC)$

The expression used will be:

$\Delta H=m\times \Delta H_{fusion}+[m\times c_{p,l}\times (T_{final}-T_{initial})]$

where,

m = mass of ice = 1100 g

$c_{p,l}$ = specific heat of liquid water = $4.18J/g^oC$

$\Delta H_{fusion}$ = enthalpy change for fusion = $6.01kJ/mole=6010J/mole=\frac{6010J/mole}{18g/mole}J/g=333.89J/g$

Molar mass of water = 18 g/mole

Now put all the given values in the above expression, we get:

$\Delta H=1100g\times 333.89J/g+[1100g\times 4.18J/g^oC\times (32.0-0)^oC]$

$\Delta H=514415J=122948.1358cal=1.23\times 10^5cal$

Conversion used : (1 cal = 4.184 J)

Therefore, the heat energy absorbed will be, $1.23\times 10^5cal$

7 0

3 years ago

There is a mixture of three gases. We know the total pressure is 2.50 atmosphere and the pressure of the oxygen and the nitrogen

Viktor [21]

Answer:

1.14 atm and 1.139 mol

Explanation:

The total pressure of the container is equal to the sum of the partial pressure of the three gasses:

P = Poxygen + Pnitrogen + Pcarbon dioxide

2.50 atm = 0.52 + 0.84 + Pcarbon dioxide

Now we solve for the pressure of carbon dioxide:

Pcarbon dioxide = 1.14 atm

To calculate the number of CO₂ moles we use PV=nRT:

P = 1.14 atm

V = 25.0 L

n = ?

R = 0.082 atm·L·mol⁻¹·K⁻¹

T = 32 °C ⇒ 32 + 273.16 = 305.16 K

1.14 atm * 25.0 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 305.16 K

n = 1.139 mol

5 0

3 years ago

PLEASE HURRY !! WILL GIVE BRAINLIEST

Montano1993 [528]

The results of new evidence can lead to changes in scientific knowledge.

7 0

3 years ago

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D is a green crystalline solid that dissolves in water to give a very pale green solution addition of sodium hydroxide solution

Ksivusya [100]

Answer:

I think its iron(II) oxide

Explanation:

The substance is black but when it's mixed with water it turns green solution so when mixed with sodium Hydroxide it turns green

5 0

2 years ago

What is the pH of an acid with a [H+] of 1.0 x 10&-4 M? 1. 4 2. 10 3. 1 4. 7

True [87]

PH scale is from 1 to 14 and indicates how acidic or basic a solution is. To find pH or pOH we need to know the H⁺ ion concentration or OH⁻ concentration.
pH can be calculated using the following equation;
pH = -log[H⁺]
the H⁺ concentration of the given acid is 1.0 x 10⁻⁴ M. substituting this we can find the pH
pH = -log[1x10⁻⁴]
pH = 4
answer is 1) 4

3 0

2 years ago