A sample of nitrogen gas (N2) contains 3. 0 x 1024 atoms of nitrogen. About how many moles of nitrogen gas are in the sample?
1). 1.0
2). 2.5
3). 3.0
4). 5.0


a= In scientific notation

6.96×10⁵ Km

b =In  expanded notation

0.00019 mm

Explanation:

Given data:

Radius of sun = 696000 Km

size of bacterial cell = 1.9 ×10⁻⁴ mm

Radius of sun in scientific notation = ?

Size of bacterial cell in expanded notation = ?

Solution:

Radius of sun:

696000 Km

In scientific notation

6.96×10⁵ Km

Size of bacterial cell:

1.9 ×10⁻⁴ mm

In  expanded notation

1.9/ 10000 = 0.00019 mm