Answer:
Explanation:
To convert from moles to grams, the molar mass is used (mass of 1 mole). The values are the same as the atomic masses on the Periodic Table, but the units are grams per mole (g/mol) instead of atomic mass units.
<h3>1. Molar Mass</h3>
We are given the compound sodium hydroxide (NaOH) and we need to look up the molar masses of the individual elements.
- Na: 22.9897693 g/mol
- O: 15.999 g/mol
- H: 1.008 g/mol
The formula for the compound has no subscripts, so there is 1 mole of each element in 1 mole of the substance. We can simply add the molar masses.
- NaOH: 22.9897693 + 15.999 + 1.008 = 39.9967693 g/mol
This means there are 39.9967693 grams of sodium hydroxide in 1 mole.
<h3>2. Convert Grams to Moles </h3>
Use the molar mass we found as a ratio.
Since we are converting 17.6 grams of NaOH to moles, we multiply by this value.
Flip the ratio so the units of grams of NaOH cancel.
<h3>3. Round </h3>
The original measurement of grams has 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place.
The 0 in the ten thousandths place (in bold above) tells us to leave the 0 in the thousandth place.
17.6 grams of sodium hydroxide are equal to <u>0.440 moles of sodium hydroxide.</u>
Answer:
3
Explanation:
left side has 2 N so right side must have a 2 which means 6 H on right side so to get 6 on left you have a coef. of 3 to make 6 H
Answer:
The answer to your question is 160 g of Fe₂O₃
Explanation:
Data
mass of Fe = 112 g
mass of CO = in excess
mass of Fe₂O₃ = ?
Balanced chemical reaction
Fe₂O₃ + 3CO ⇒ 2Fe + 3CO₂
Process
1.- Calculate the molar mass of Fe₂O₃ and Fe
Molar mass Fe₂O₃ = (56 x 2) + (16 x 3) = 112 + 48 = 160 g
atomic mass of Fe = 56
2.- Use proportions to calculate the mass of Fe₂O₃ needed
160 g of Fe₂O₃ ------------------- 2(56) g of Fe
x g of Fe₂O₃ ------------------ 112 g of Fe
x = (112 x 160) / 2(56)
x = 17920/112
x = 160 g of Fe₂O₃
Answer:
Chemical reaction B, because the product is a compound
Explanation:
A synthesis or combination reaction is that reaction that involves combination of two or more reactants to form a single product. The two or more reactants are often elements that chemically combine to form a single compound.
In this question, two chemical reactions are involved in which chemical reaction A has 1 reactants and 3 products while chemical reaction B has 2 reactants and 1 product. Based on the explanation above, the reaction B correctly identifies the synthesis reaction because the single product is a compound.
Explanation:
the proper format for scientific notation the following conditions must be true
