Answer :

To find out how many grams of nickel are in 1.57 moles of Ni, we can use the concept of molar mass. The molar mass of a substance tells us the mass of one mole of that substance. For nickel (Ni), the molar mass is given as 58.69 grams per mole.

Here's a step-by-step solution:

1. Identify the given values:
- Molar mass of nickel (Ni) = 58.69 grams/mole.
- Number of moles of nickel = 1.57 moles.

2. Set up the calculation:
To calculate the mass in grams, we use the formula:
[tex]\[
\text{Mass in grams} = \text{Number of moles} \times \text{Molar mass}
\][/tex]

3. Substitute the known values into the formula:
[tex]\[
\text{Mass in grams} = 1.57 \, \text{moles} \times 58.69 \, \text{grams/mole}
\][/tex]

4. Perform the multiplication:
[tex]\[
\text{Mass in grams} = 92.1433 \, \text{grams}
\][/tex]

So, there are 92.1433 grams of nickel in 1.57 moles of Ni.

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