Temperature Scale Conversion
1. Express these temperatures in degrees Fahrenheit and in kelvins.
b. the temperature of a winter day at the North Pole (-40.0°C)
c. the melting point of gold (1064°C)

b. -40 ° F , 233 K

c. 1947.2 °F , 1337 K

Explanation: To convert degree Celsius to Fahrenheit we will use the following formula.

°F = 9/5 x ( °C ) + 32

= 9/5 x (-40.0 °C ) + 32 = -40 °F

°F = 9/5 x ( °C ) + 32

= 9/5 x (1064 °C ) + 32 = 1947.2 °F

To solve for Kelvin just add 273 in °C.

-40.0°C + 273 = 233 K

1064 °C + 273 = 1337 K

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

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