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Q: Calculate the percent composition by mass of potassium in K2CrO4
A: Assuming we are having 1 mole of K2CrO4 Molar mass of K2CrO4 = (39*2 + 52 + 16*4) = 194 g/mol
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- The principal component of mothballs is naphthalene, a compound with a molecular mass of about 130 amu, containing only carbon and hydrogen. A 3.000-mg sample of naphthalene burns to give 10.3 mg of CO2. Determine its empirical and molecular formulas.Vindexhtml? con con&extermal browser-08daunchUri-https253A252% Ch 3. 31-36 3 attempts left Check my work Click in the answer box to activate the palette. Determine the empirical formula of a compound having the following percent composition by mass: K: 24.74%; Mn: 34.76%; O: 40.50% < PrevO 3G lI.. CHEM 310 and 312 Homework O... p CHEM 310 and CHEM 312 Homework # 1 Q1) The combustion of an 8.23-mg sample of unknown substance gave 9.62 mg CO: and 3.94 mg H:0. Another sample, weighing 5.32 mg, gave 13.49 mg AgCl in a halogen analysis. Determine the percentage composition and empirical formula for this organic compound.
- Esc Aktiv app.101edu.co I. Brightspace Walmart - Hiring Ce... < 7 A F1 1 a CD Z What quantity in moles of KCI are there in 50.0 mL of 0.140 M KCI? + E 2 W S Alt X O F3 - # 3 E D с FA $ 4 F R F5 F % 5 FO 44 T G 6 B F7 Y H F8 & 7 U Question 8 of 9 N DELL F9 J * 8 P F10 a M F11 JI K * O V ) O L Alt F12 P ; 336 40 DE Priser T Ctri 7 +/- 30 A w Insert ? 114. Find the empirical formula for a compound with 27.5%K, 37.5%Mn, and 35%O. Ko.5 Mno.502 O K2MNO4 O K2MN2O3 K;Mn;O161.) Calculate the moles of KHP in flask #1. grams KHP Molar Mass of KHP (A1) 204.22 g/mol moles KHP = 1.224 (A10) %D 204.22 g/mol
- Caffeine (MM = 194.2 g/mol) is a small molecule that many people ingest for its stimulant effects. Elemental %3D analysis shows that this compound contains 49.5% C, 5.19% H, 28.9% N and 16.5% O by mass. (a) Determine the empirical formula of Caffeine? (b) Determine the molecular formula of Caffeine? Clearly show your work.e greatest 9 Schoology M Drafts (1) - 1024733@lcps.org x + - learn.lcps.org/common-assessment-delivery/start/4846618960?action=Donresume&submissionld3D4920 The Mole Reassessment (MC) Identify the correct mathematical calculation to determine the number of moles in 9.85 grams of N,. O multiply by the formula mass of nitrogen, N2 O divide by the formula mass of nitrogen, N2 O multiply by Avogadro's number O divide by Avogadro's number O multiply by Avogadro's number and multiply by the formula mass of nitrogen, N2 O multiply by Avogadro's number and divide by the formula mass of nitrogen, N2 divide by Avogadro's number and multiply by the formula mass of nitrogen, N2 O divide by Avogadro's number and divide by the formula mass of nitrogen, N, 9. 10 Support | ScHE O C What is the number of formula units in a 6.07 mol sample of FeCl₂? $ T number of formula units: R F V G Search or type URL % 5 T G B MacBook Pro 6 Y H & 7 N U J 20. * 8 M I ✪ K ( 9 H < < I O L ) O A P л. : ; I command option * { [ ? 1 + = 11 I formula units O } 1 delete return shift
- Wondershare PDFelement Pro File Edit View Tool Go Window Help 69% [4) A АВС Wed 1:12 PM 7.(a) Compound X has the following percentage composition by mass: C: 38.9% ; H: 5.4% ; Cl: 38.4%; O: 17.3% (i) Calculate the empirical formula of X. (Relative atomic mass of C = 12; H = 1; Cl= 35.5; O= 16.0) C H Cl % by mass of atoms relative no. of mole of atoms (= % by mass ÷ relative atomic mass) simplest mole ratio of atoms (divided by the smallest no. of mole) The empirical formula of X is (ii) Find out the molecular formula of X if the relative molecular mass of X is 92.5. (c) If X is an optically alkanal, give the structural formula X and draw this pair of enantiomers. Structural formula of X : (b) If X has a C=C bond and a saturated OH group (i.e. The OH group does not attach to the C=C), give the structural formula of X if X shows cis-trans isomerism. Draw the pair of cis-trans isomers. Structural formula of X :MOLAR VIEW T03/S11 If a sample of (NH4)2HPO4 is found to contain 3.79 mol of NH4+ ions how many moles of HPO,2- ions are present? Molar Mass (g/mol) (NH4)2HPO4 HPO,2- ion NH,+ ion Avogadro's No. (mol-1) 6.022x1023 132.06 95.980 18.039 the tolerance is +/-2%tage of oxy X 8 Schoology M Drafts (1) - 1024733@lcps.org X A learn.lcps.org/common-assessment-delivery/start/4846618960?action=Donresume&submissionld=492623761 The Mole Reassessment (MC) Identify the correct mathematical calculation to determine the number of molecules in 20.0 grams of water. O multiply by the formula mass of water divide by the formula mass of water O multiply by Avogadro's number O divide by Avogadro's number O multiply by Avogadro's number and multiply by the formula mass of water multiply by Avogadro's number and divide by the formula mass of water O divide by Avogadro's number and multiply by the formula mass of water divide by Avogadro's number and divide by the formula mass of water 7 Support | Schoolos s.org/common-assessment-delivery/start/4846618960?action=onresume&submissionld-492623761#