Question

1. Suppose that a recipe calls for an oven temperature of 189°F. Convert this temperature to degrees Celsius and to kelvins.

--I found that Celsius is 87.2, plug it in K=C+273, got 360.2 but it was wrong.

(e) Neon, the gaseous element used to make electronic signs, has a melting point of -248.6°C and a boiling point of -246.1°C. Convert these temperatures to kelvins.
-- Plugged it in K=C+273 and had the same exact problem as the top too. Help me!! What am I doing wrong?

Answer 1

1.
Recall that the formula for converting deg F to deg C is
C = (5/9)*(F - 32)
Substituting,
C = (5/9)*(189 - 32)
C = (5/9)*(157)
C = 87.2 deg Celsius
To convert to Kelvin,
K = C + 273.15
K = 87.2 + 273.15
K = 360.37 Kelvin

2.
K = C + 273
K = -248.6 + 273.15
K = 24.55 Kelvin (melting point)

K = C + 273
K = -246.1 + 273.15
K = 27.05 Kelvin (boiling point)

Your answers are correct. I don't know why they're wrong, probably there's a typo or something...
Hope this helps~ :)