A silver block, initially at 56.1 ∘C, is submerged into 100.0 g of water at 24.0 ∘C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 28.0∘C. What is the mass of the silver block?

The mass of the silver block is 256 grams

Explanation:

As we know that,  

        .................(1)

where,

q = heat absorbed or released

= mass of silver = ?

= mass of water = 100.0 g

= final temperature =

= temperature of silver =

= temperature of water =

= specific heat of silver =

= specific heat of water=

Now put all the given values in equation (1), we get

Therefore, the mass of the silver block is 256 grams

calculate how many grams of ammonia can be produced from 4.21 grams of

n2 + 3h2 = 2nh3

my answer:

25.0g n2 x (1 mol/ 28.0gn2) x (2 mol nh3/ 1 mol n2) x (17.0g nh3/ 1 molnh3) = 30.36g n2

25.0g h2 x (1 mol h2/ 2.00g h2) x (2 mol nh3/ 3 mol h2) x (17.0g nh3/ 1 mol nh3) = 141.67g h2

lr = n2

1 a

2 d

3 a

4 c

explanation: