# Tutor profile: Monique S.

## Questions

### Subject: Pre-Algebra

X^3 * X^3

When multiplying, in reality the addition rule is being applied so 3+3=6 The answer is X^6

### Subject: Basic Math

(7x8) + 3

First the information in the parenthesis must be done: 7x8 = 56 then 3 could be added making the total: 59

### Subject: Chemistry

If 1.35kg of Na2CO3 is treated with excess amount of Ca(OH)2, what is the amount (in g) of NaOH that can be produced?

First, the balanced equation must be produced: 1Na2CO3 + 1Ca(OH)2 --> 2NaOH + 1 CaCO3 Then the molar mass of the values needed must be found and calculated based on the periodic table: 105.99g/mol Na2CO3 and 40.00g/mol NaOH Then calculate 1.35kg Na2CO3 x (10^3g/1kg) x (1mol Na2CO3/ 105.99 g Na2CO3) x (2 mol NaOH/ 1 mol Na2CO3) x (40.00 g NaOH/ 1 mol NaOH)= 1018.964 g NaOH Last, significant figures must be in place and therefore the answer is: 1.02x 10^3 g NaOH

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