Brainlies !me : )

how do i add using significant rules? explain.

I Can explain in the simplified explaination

Explanation:

When adding and subtracting numbers, the rules of significant figures require that the number of places after. the decimal point in the answer is less than or equal to the number of decimal places in every term in the. sum. (Treat subtraction as adding the same number with a negative sign in front of it.)

This are the Rules

Non-zero digits are always significant.

Any zeros between two significant digits are significant.

A final zero or trailing zeros in the decimal portion ONLY are significant.

For numbers with decimal points, zeros to the right of a non zero digit are significant. Thus 6.00 has three significant figures and 0.050 has two significant figures. For this reason it is important to keep the trailing zeros to indicate the actual number of significant figures.

Thank you for asking this Question im strong in math!

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g