Achieve question 5

[April_Tello_2H]

My question is :

How many photons with a wavelength of 879 nm are needed to melt 419 g of ice?

I understand that I would start by multiplying the enthalpy of fusion which is 333.6 J/g and then I multiplied it by my mass of 419 g then giving me 139778.4. Then I understand to be able to convert my 879 nm I would have to use the E=hc/lambda equation, but how would I find what lambda is ? Is it just 139778.4 ? Am I still missing a conversion somewhere ?
I would truly appreciate if someone can help me on this part ! Thank you

[Lucas Vu 2G]

Lambda is wavelength so you would use the given wavelength as your lambda. Make sure to remember that when using wavelength in an equation you have to convert it into meters so your lambda would actually be 879 x 10^-9m which is equal to 879 nm.

[Diana Alvarez 3A]

Lambda is the wavelength and it was given to you as 879 nm, which is the same as 879 x 10^-9 m.